Difference between revisions of "PhET-Simulations-for-Biology/C2/Introduction-to-PhET-Simulations/English-timed"

From Script | Spoken-Tutorial
Jump to: navigation, search
 
(One intermediate revision by one other user not shown)
Line 10: Line 10:
 
|00:06
 
|00:06
 
| In this tutorial, we will learn-
 
| In this tutorial, we will learn-
−
to open '''PhET''' webpage,
+
1. To open '''PhET''' webpage,
−
about '''PhET simulation''',
+
 
 +
2. About '''PhET simulation''',
  
 
|-
 
|-
 
|00:15
 
|00:15
−
|to '''register/Sign in''' on the page,
+
|3. To '''register/Sign in''' on the page,
−
to browse activities,  
+
 
−
to share your activities page, about tips for using '''PhET''',
+
4. To browse activities,  
 +
 
 +
5. To share your activities page,  
 +
 
 +
6. About tips for using '''PhET''',
  
 
|-
 
|-
 
|00:27
 
|00:27
−
|about '''offline access''',
+
|7. About offline access,
−
to choose the '''simulations''' based on subject and grade level,
+
 
−
to download '''simulations''' of different file formats used in '''PhET''',
+
8. To choose the '''simulations''' based on subject and grade level,
 +
 
 +
9. To download '''simulations''' of different file formats used in '''PhET''',
 
   
 
   
 
|-
 
|-
 
|00:40
 
|00:40
−
|to open the downloaded '''simulations'''.
+
|10. To open the downloaded '''simulations'''.
  
 
|-
 
|-
Line 35: Line 42:
 
|-
 
|-
 
|00:47
 
|00:47
−
| Here, I am using: '''Ubuntu Linux OS''' version 14.04,
+
| Here, I am using: Ubuntu Linux OS version 14.04,
  
−
'''Firefox web Browser''' version 53.02.2,
+
Firefox web Browser version 53.02.2,
  
−
'''Java''' version 1.7,
+
Java version 1.7,
  
−
'''Flash player''' version 26.0.0.131.
+
Flash player version 26.0.0.131.
  
 
|-
 
|-
 
|01:08
 
|01:08
−
| Files to download and Install: '''Flash Player''' and '''Java''' are provided in the '''code files''' link. Use the link to download and install the files.
+
| Files to download and Install: '''Flash Player''' and '''Java''' are provided in the '''code files''' link.  
 +
 
 +
Use the link to download and install the files.
  
 
|-
 
|-
Line 58: Line 67:
 
|-
 
|-
 
|01:38
 
|01:38
−
|''PhET interactive Simulations''' page opens.
+
|'''PhET interactive Simulations''' page opens.
  
 
|-
 
|-
 
|01:42
 
|01:42
−
| Now, let us see how to register on the page. Click on the '''REGISTER''' button on the top-right corner of the page.
+
| Now, let us see how to register on the page.  
 +
 
 +
Click on the '''REGISTER''' button on the top-right corner of the page.
  
 
|-
 
|-
Line 70: Line 81:
 
|-
 
|-
 
|01:54
 
|01:54
−
|Type the relevant data in appropriate '''field'''s/text boxes.
+
|Type the relevant data in appropriate fields/text boxes.
 +
 
 
For example, your valid '''Email id''', '''First name''', '''Organization''' and other details.
 
For example, your valid '''Email id''', '''First name''', '''Organization''' and other details.
  
 
|-
 
|-
 
|02:11
 
|02:11
−
|Click on '''REGISTER''' button at the bottom of the page. I have already registered on this page.
+
|Click on '''REGISTER''' button at the bottom of the page.  
 +
 
 +
I have already registered on this page.
  
 
|-
 
|-
Line 103: Line 117:
 
|-
 
|-
 
|02:56
 
|02:56
−
|Enter the password. Click on '''Sign In''' button.
+
|Enter the password.  
 +
 
 +
Click on '''Sign In''' button.
  
 
|-
 
|-
Line 119: Line 135:
 
|-
 
|-
 
|03:20
 
|03:20
−
|I will click on the '''play''' button and play the video for sometime.
+
|I will click on the play button and play the video for sometime.
  
 
|-
 
|-
 
|03:27
 
|03:27
−
|On the right-side panel, '''Videos About PhET''' are listed. Click on the videos and watch them.  
+
|On the right-side panel, '''Videos About PhET''' are listed.  
 +
 
 +
Click on the videos and watch them.  
  
 
|-
 
|-
 
|03:36
 
|03:36
−
|Back to the '''home page'''. Click on '''Browse Activities''' link. '''Browse Activities''' page opens.
+
|Back to the '''home page'''.  
 +
 
 +
Click on '''Browse Activities''' link.  
 +
 
 +
'''Browse Activities''' page opens.
  
 
|-
 
|-
 
|03:45
 
|03:45
−
|Here, we have the following lists. '''Simulations''', '''Types''',''' Levels''' and '''Languages'''.
+
|Here, we have the following lists.  
 +
 
 +
'''Simulations''', '''Types''',''' Levels''' and '''Languages'''.
  
 
|-
 
|-
Line 143: Line 167:
 
|-
 
|-
 
|04:05
 
|04:05
−
|In '''Types''' list, I will select '''Lab'''. In '''Levels''', I will select '''High School''', '''HS'''.
+
|In '''Types''' list, I will select '''Lab'''. In '''Levels''', I will select high school, '''HS'''.
−
 
+
 
|-
 
|-
 
|04:14
 
|04:14
Line 151: Line 174:
 
|-
 
|-
 
|04:18
 
|04:18
−
|Click on '''browse''' button. Activities related to the simulation will be displayed.
+
|Click on '''browse''' button.  
 +
 
 +
Activities related to the simulation will be displayed.
  
 
|-
 
|-
 
|04:25
 
|04:25
−
|Select the activity by clicking on the '''TITLE'''. There is also an option to download the activity.
+
|Select the activity by clicking on the '''TITLE'''.  
 +
 
 +
There is also an option to download the activity.
  
 
|-
 
|-
 
|04:33
 
|04:33
−
| Go to the '''home page''' by clicking on the back arrow button. Click on '''Share your Activities''' link.
+
| Go to the home page by clicking on the back arrow button.  
 +
 
 +
Click on '''Share your Activities''' link.
  
 
|-
 
|-
 
|04:42
 
|04:42
−
| If you have already '''signed in''', this page opens directly. Page opens with '''Author’s name''', '''Author’s organization''' and '''Contact email'''.
+
| If you have already signed in, this page opens directly.  
 +
 
 +
Page opens with '''Author’s name''', '''Author’s organization''' and '''Contact email'''.
  
 
|-
 
|-
Line 179: Line 210:
 
|-
 
|-
 
|05:13
 
|05:13
−
|Choose your file with allowed extension to upload.  I have already filled in the relevant data.
+
|Choose your file with allowed extension to upload.   
 +
 
 +
I have already filled in the relevant data.
  
 
|-
 
|-
 
|05:21
 
|05:21
−
|Click on '''Licensing Agreement''' check box after reading the License agreement. Click on '''SUBMIT ACTIVITY''' button.
+
|Click on '''Licensing Agreement''' check box after reading the License agreement.  
 +
 
 +
Click on '''SUBMIT ACTIVITY''' button.
  
 
|-
 
|-
 
|05:31
 
|05:31
−
|'''Update Success''' message appears. Let us go back to the home page. Click on the link '''Tips for Using PhET'''.
+
|'''Update Success''' message appears.  
 +
 
 +
Let us go back to the home page. Click on the link '''Tips for Using PhET'''.
  
 
|-
 
|-
 
|05:42
 
|05:42
−
| A new page opens with videos that explain how to use '''PhET simulations'''. You can explore these videos on your own.
+
| A new page opens with videos that explain how to use '''PhET simulations'''.  
 +
 
 +
You can explore these videos on your own.
  
 
|-
 
|-
Line 199: Line 238:
 
|-
 
|-
 
|05:57
 
|05:57
−
|You can either click on '''Play''' button or '''Play with Simulations''' link.  
+
|You can either click on play button or '''Play with Simulations''' link.  
  
 
|-
 
|-
Line 217: Line 256:
 
'''HTML5''',
 
'''HTML5''',
  
−
Subject-wise Sims,
+
'''Subject-wise Sims''',
  
 
'''By Grade Level''',
 
'''By Grade Level''',
Line 243: Line 282:
 
|-
 
|-
 
|06:44
 
|06:44
−
|Again choose the link as per your requirement. I will click on '''High School''' link.
+
|Again choose the link as per your requirement.  
 +
 
 +
I will click on '''High School''' link.
  
 
|-
 
|-
Line 251: Line 292:
 
|-
 
|-
 
|06:59
 
|06:59
−
|To view all the available '''Sims''', click on '''All Sims''' link. A new page opens with all the '''Sims'''.
+
|To view all the available '''Sims''', click on '''All Sims''' link.  
 +
 
 +
A new page opens with all the '''Sims'''.
  
 
|-
 
|-
Line 268: Line 311:
 
|07:34
 
|07:34
 
|We can directly open '''HTML''' format and '''flash''' format '''simulations''' by clicking on them.
 
|We can directly open '''HTML''' format and '''flash''' format '''simulations''' by clicking on them.
−
Click on the play button. The '''simulation''' window opens .  
+
 
 +
Click on the play button.  
 +
 
 +
The '''simulation''' window opens .  
  
 
|-
 
|-
 
|07:48
 
|07:48
−
|We can work with the '''simulation''' till we are connected to Internet. Back to the previous page.
+
|We can work with the '''simulation''' till we are connected to Internet.  
 +
 
 +
Back to the previous page.
  
 
|-
 
|-
 
|07:56
 
|07:56
−
| To download the '''simulation''' for '''off-line''' use, let us select '''Atomic Interactions  PhET simulation'''.
+
| To download the '''simulation''' for off-line use, let us select '''Atomic Interactions  PhET simulation'''.
  
 
|-
 
|-
Line 300: Line 348:
 
|-
 
|-
 
|08:31
 
|08:31
−
|To open the '''simulation''', right-click on the file. Choose the option '''Open With Firefox Web Browser'''. File opens in the browser.
+
|To open the '''simulation''', right-click on the file.  
 +
 
 +
Choose the option '''Open With Firefox Web Browser'''.  
 +
 
 +
File opens in the browser.
  
 
|-
 
|-
 
|08:43
 
|08:43
−
| This is the interface of '''atomic-interactions simulation'''. Click on various element radio buttons and explore the '''simulation'''.
+
| This is the interface of '''atomic-interactions simulation'''.  
 +
 
 +
Click on various element radio buttons and explore the '''simulation'''.
  
 
|-
 
|-
Line 312: Line 366:
 
|-
 
|-
 
|08:56
 
|08:56
−
|Let's download a '''simulation''' that can be opened as '''Java''' file. For this, I will use the simulation '''Battery-Resistor Circuit'''.
+
|Let's download a '''simulation''' that can be opened as '''Java''' file.  
 +
 
 +
For this, I will use the simulation '''Battery-Resistor Circuit'''.
  
 
|-
 
|-
Line 324: Line 380:
 
|-
 
|-
 
|09:18
 
|09:18
−
|Select '''Save File''' radio button. Click on '''Ok''' button. File will be downloaded to the '''Downloads''' folder.
+
|Select '''Save File''' radio button.  
 +
 
 +
Click on '''Ok''' button. File will be downloaded to the '''Downloads''' folder.
  
 
|-
 
|-
Line 344: Line 402:
 
|-
 
|-
 
|09:58
 
|09:58
−
|'''Battery-Resistor Circuit simulation''' opens. Do not close the terminal, it will '''kill''' the process. Click '''Cancel''' to continue.
+
|'''Battery-Resistor Circuit simulation''' opens.  
 +
 
 +
Do not close the terminal, it will '''kill''' the process.  
 +
 
 +
Click '''Cancel''' to continue.
  
 
|-
 
|-
Line 360: Line 422:
 
|-
 
|-
 
|10:25
 
|10:25
−
|For off-line use, download the '''simulation'''. After downloading, use terminal to open the '''simulation'''.
+
|For off-line use, download the '''simulation'''.  
 +
 
 +
After downloading, use terminal to open the '''simulation'''.
  
 
|-
 
|-
Line 408: Line 472:
 
|-
 
|-
 
|11:34
 
|11:34
−
|I am a '''Linux''' user. So, I will use '''Linux''' installer.
+
|I am a linux user. So, I will use linux installer.
  
 
|-
 
|-
 
|11:39
 
|11:39
−
| '''Opening PhET-Installer-with-activities_Linux.bin''' dialog box opens. Click on '''Save File''' button.
+
| '''Opening PhET-Installer-with-activities_Linux.bin''' dialog box opens.  
 +
 
 +
Click on '''Save File''' button.
  
 
|-
 
|-
Line 420: Line 486:
 
|-
 
|-
 
|11:53
 
|11:53
−
|Downloading the files takes a few minutes. I have already downloaded the '''Linux installer''' file to my '''Downloads''' folder.
+
|Downloading the files takes a few minutes.  
 +
 
 +
I have already downloaded the '''Linux installer''' file to my '''Downloads''' folder.
  
 
|-
 
|-
Line 434: Line 502:
 
| Let us summarize. In this tutorial, we have learnt:
 
| Let us summarize. In this tutorial, we have learnt:
  
−
to open '''PhET''' webpage.About '''PhET simulation''',
+
1. To open '''PhET''' webpage.
  
−
to '''register/Sign in''' on the page,
+
2. About '''PhET simulation''',
 +
 
 +
3. To '''register/Sign in''' on the page,
  
 
|-
 
|-
 
|12:26
 
|12:26
−
|to browse activities, to share your activities page, about tips for using '''PhET''', about '''offline access''',
+
|4. To browse activities,  
 +
 
 +
5. To share your activities page,  
 +
 
 +
6. About tips for using '''PhET''',  
 +
 
 +
7. About offline access,
 +
 
  
 
|-
 
|-
 
|12:37
 
|12:37
−
|to choose the '''simulations''' based on subject and grade level,
+
|8. To choose the '''simulations''' based on subject and grade level,
  
 
|-
 
|-
 
|12:42
 
|12:42
−
|to download '''simulations''' of different file formats used in '''PhET''', to open the downloaded '''simulations'''.
+
|9. To download '''simulations''' of different file formats used in '''PhET''',  
 +
 
 +
10. To open the downloaded '''simulations'''.
  
 
|-
 
|-
Line 456: Line 535:
 
|-
 
|-
 
|12:58
 
|12:58
−
|The '''Spoken Tutorial Project''' team: conducts workshops using spoken tutorials and gives certificates on passing online tests.  
+
|The '''Spoken Tutorial Project''' team: conducts workshops using spoken tutorials and  
 +
 
 +
gives certificates on passing online tests.  
 +
 
 
For more details, please write to us.
 
For more details, please write to us.
  
Line 465: Line 547:
 
|-
 
|-
 
|13:13
 
|13:13
−
|Please visit this site. Choose the minute and second where you have the question. Explain your question briefly.
+
|Please visit this site.  
 +
 
 +
Choose the minute and second where you have the question.  
 +
 
 +
Explain your question briefly.
  
 
|-
 
|-
Line 473: Line 559:
 
|-
 
|-
 
|13:24
 
|13:24
−
| The Spoken Tutorial forum is for specific questions on this tutorial. Please do not post unrelated and general questions on them. This will help reduce the clutter.
+
| The Spoken Tutorial forum is for specific questions on this tutorial.  
 +
 
 +
Please do not post unrelated and general questions on them.  
 +
 
 +
This will help reduce the clutter.
  
 
|-
 
|-
Line 485: Line 575:
 
|-
 
|-
 
|13:49
 
|13:49
−
| Spoken Tutorial Project is funded by NMEICT, MHRD, Government of India. More information on this mission is available at this link.
+
| Spoken Tutorial Project is funded by NMEICT, MHRD, Government of India.  
 +
 
 +
More information on this mission is available at this link.
  
 
|-
 
|-
 
|14:00
 
|14:00
 
|This tutorial is contributed by Madhuri Ganapathi and Meenal Ghoderao from IIT Bombay. Thank you for joining.
 
|This tutorial is contributed by Madhuri Ganapathi and Meenal Ghoderao from IIT Bombay. Thank you for joining.
−
 
+
|-
 
|}
 
|}

Latest revision as of 18:39, 10 August 2022

Timed Narration
00:01 Welcome to this tutorial on Introduction to PhET simulations.
00:06 In this tutorial, we will learn-

1. To open PhET webpage,

2. About PhET simulation,

00:15 3. To register/Sign in on the page,

4. To browse activities,

5. To share your activities page,

6. About tips for using PhET,

00:27 7. About offline access,

8. To choose the simulations based on subject and grade level,

9. To download simulations of different file formats used in PhET,

00:40 10. To open the downloaded simulations.
00:43 To follow this tutorial, you should have internet connection.
00:47 Here, I am using: Ubuntu Linux OS version 14.04,

Firefox web Browser version 53.02.2,

Java version 1.7,

Flash player version 26.0.0.131.

01:08 Files to download and Install: Flash Player and Java are provided in the code files link.

Use the link to download and install the files.

01:20 Now let us open PhET simulations page.
01:24 Open your default web browser and enter the address:

http://phet.colorado.edu and press Enter.

01:38 PhET interactive Simulations page opens.
01:42 Now, let us see how to register on the page.

Click on the REGISTER button on the top-right corner of the page.

01:51 Register page opens.
01:54 Type the relevant data in appropriate fields/text boxes.

For example, your valid Email id, First name, Organization and other details.

02:11 Click on REGISTER button at the bottom of the page.

I have already registered on this page.

02:19 To confirm the registration, open your Gmail account.
02:25 Click on the link sent by PhET Interactive simulations to activate the registration.
02:32 After you have registered, you can sign in.
02:36 Click on SIGN IN button, beside REGISTER button, at the top of the page.
02:43 Sign In by using your registered Email id and Password.
02:48 I will Sign In using my registered email id, school.science13@gmail.com.
02:56 Enter the password.

Click on Sign In button.

03:01 Now let us click on the link What is PhET?.
03:05 A new page opens with a heading About PhET. This page has information about PhET.
03:13 Below this information, we have a short video about introduction to PhET simulations.
03:20 I will click on the play button and play the video for sometime.
03:27 On the right-side panel, Videos About PhET are listed.

Click on the videos and watch them.

03:36 Back to the home page.

Click on Browse Activities link.

Browse Activities page opens.

03:45 Here, we have the following lists.

Simulations, Types, Levels and Languages.

03:56 Scroll the lists and select based on your requirement.
04:01 In Simulations list, I will select Bending light.
04:05 In Types list, I will select Lab. In Levels, I will select high school, HS.
04:14 In Languages, I will select English.
04:18 Click on browse button.

Activities related to the simulation will be displayed.

04:25 Select the activity by clicking on the TITLE.

There is also an option to download the activity.

04:33 Go to the home page by clicking on the back arrow button.

Click on Share your Activities link.

04:42 If you have already signed in, this page opens directly.

Page opens with Author’s name, Author’s organization and Contact email.

04:54 In the Simulations box, choose the simulation for which you are going to upload the activity.
05:00 In Upload file(s) option, allowed file extension formats are listed.
05:06 Click on CHOOSE FILE button. File Upload dialog box opens.
05:13 Choose your file with allowed extension to upload.

I have already filled in the relevant data.

05:21 Click on Licensing Agreement check box after reading the License agreement.

Click on SUBMIT ACTIVITY button.

05:31 Update Success message appears.

Let us go back to the home page. Click on the link Tips for Using PhET.

05:42 A new page opens with videos that explain how to use PhET simulations.

You can explore these videos on your own.

05:53 Back to the home page of PhETs .
05:57 You can either click on play button or Play with Simulations link.
06:03 A simulations page opens.
06:06 On the left side of the page, you can see a heading called Simulations.
06:12 Under the heading, we have a list of links.

New Sims,

HTML5,

Subject-wise Sims,

By Grade Level,

Teacher Resources and other links.

06:26 Here we can choose the appropriate links as per requirement.
06:30 Let us click on By Grade Level link.
06:34 A new page opens with four links:

Elementary School,

Middle School,

High School and University.

06:44 Again choose the link as per your requirement.

I will click on High School link.

06:51 All simulations that are under High School category are displayed on the new page.
06:59 To view all the available Sims, click on All Sims link.

A new page opens with all the Sims.

07:08 Scroll down the page. Notice that we have Simulations in 3 different formats HTML, Java and Flash.
07:19 They are denoted by icons on the bottom-right corner of the simulation.
07:25 The simulations in HTML format are denoted by HTML5 icon, at the bottom-right corner of the window.
07:34 We can directly open HTML format and flash format simulations by clicking on them.

Click on the play button.

The simulation window opens .

07:48 We can work with the simulation till we are connected to Internet.

Back to the previous page.

07:56 To download the simulation for off-line use, let us select Atomic Interactions PhET simulation.
08:03 Click on Download button to download the file.
08:07 Opening atomic-interactions_en.html file dialog box opens.
08:14 Select Save File radio button. Click on Ok button.
08:20 In my system, file will be downloaded to the Downloads folder.
08:25 Here is the downloaded HTML file of atomic-interactions simulation.
08:31 To open the simulation, right-click on the file.

Choose the option Open With Firefox Web Browser.

File opens in the browser.

08:43 This is the interface of atomic-interactions simulation.

Click on various element radio buttons and explore the simulation.

08:53 Let us go to the simulations page.
08:56 Let's download a simulation that can be opened as Java file.

For this, I will use the simulation Battery-Resistor Circuit.

09:07 To download the file, click on Download button.
09:11 Opening battery-resistor-circuit_en.jar file dialog box opens.
09:18 Select Save File radio button.

Click on Ok button. File will be downloaded to the Downloads folder.

09:27 To work with a jar file, we require terminal in Ubuntu.
09:32 To open the terminal, press Ctrl , Alt and T keys simultaneously.
09:38 At the prompt, type: cd Downloads and press Enter.
09:44 Then type: java space hyphen jar space battery-resistor-circuit_en.jar and press Enter.
09:58 Battery-Resistor Circuit simulation opens.

Do not close the terminal, it will kill the process.

Click Cancel to continue.

10:09 Back to the previous page of PhETs.
10:13 Now we will download a simulation that can be opened using Flash reader.
10:19 For this, I will use Calculus Grapher simulation as an example.
10:25 For off-line use, download the simulation.

After downloading, use terminal to open the simulation.

10:33 Click on the simulation. Calculus Grapher simulation opens with a player. Explore the simulation.
10:41 Back to the Home page of PhETs.
10:45 At the bottom of the page, click on OFFLINE ACCESS link.
10:49 You can see three options:

1.Desktop/Laptop Computer

2.Chrome book

3. iPad.

10:58 Click on Desktop/Laptop Computer option.
11:02 Here, again we have two installer options, Download installer with simulations only (no activities) and Download installer with simulations and activities.
11:16 I will choose the second installer option- Download installer with simulations and activities.
11:23 Depending on your operating system you can choose-

Windows(includes Java),

Mac OS X,

Linux,

11:34 I am a linux user. So, I will use linux installer.
11:39 Opening PhET-Installer-with-activities_Linux.bin dialog box opens.

Click on Save File button.

11:49 The file will be saved in the Downloads folder.
11:53 Downloading the files takes a few minutes.

I have already downloaded the Linux installer file to my Downloads folder.

12:03 As an assignment:

Explore the PhET interactive simulations webpage.

Download and open simulations of different file formats.

12:13 Let us summarize. In this tutorial, we have learnt:

1. To open PhET webpage.

2. About PhET simulation,

3. To register/Sign in on the page,

12:26 4. To browse activities,

5. To share your activities page,

6. About tips for using PhET,

7. About offline access,


12:37 8. To choose the simulations based on subject and grade level,
12:42 9. To download simulations of different file formats used in PhET,

10. To open the downloaded simulations.

12:51 The video at the following link summarizes the Spoken Tutorial project. Please download and watch it.
12:58 The Spoken Tutorial Project team: conducts workshops using spoken tutorials and

gives certificates on passing online tests.

For more details, please write to us.

13:10 Do you have questions in THIS Spoken Tutorial?
13:13 Please visit this site.

Choose the minute and second where you have the question.

Explain your question briefly.

13:21 Someone from our team will answer them.
13:24 The Spoken Tutorial forum is for specific questions on this tutorial.

Please do not post unrelated and general questions on them.

This will help reduce the clutter.

13:36 With less clutter, we can use this discussions as instructional material.
13:41 This project is partially funded by Pandit Madan Mohan Malaviya National Mission on Teachers and Teaching.
13:49 Spoken Tutorial Project is funded by NMEICT, MHRD, Government of India.

More information on this mission is available at this link.

14:00 This tutorial is contributed by Madhuri Ganapathi and Meenal Ghoderao from IIT Bombay. Thank you for joining.

Contributors and Content Editors

Madhurig, Nancyvarkey, Pratik kamble, Sandhya.np14

Retrieved from "https://script.spoken-tutorial.org/index.php?title=PhET-Simulations-for-Biology/C2/Introduction-to-PhET-Simulations/English-timed&oldid=55969"