The PhET Blog

## Water Waves, Jump Rope Waves: Explore with Wave on a String

Use the #HTML5 Wave on a String to learn about wave properties. Watch a string vibrate in slow motion. Wiggle the end of the string and make waves, or adjust the frequency and amplitude of an oscillator. Adjust the damping and tension. The end can be fixed, loose, or open.

## New #HTML5 Molecules and Light

Try the new #HTML5 Molecules and Light simulation. Do you ever wonder how a greenhouse gas affects the climate, or why the ozone layer is important? Use the sim to explore how light interacts with molecules in our atmosphere.

## See PhET at NCTM 2015 April 15-18 in Boston

See us at our Booth #647 at the exhibit hall. And, on Friday, learn about how to use PhET Sims in your math classes with Karina Hansberry and Amanda McGarry.

Practical Strategies for Teaching with Interactive Computer Simulations
Friday, April 17, 2015: 11:00 AM-12:00 PM
153 C (BCEC)
You can use interactive simulations (sims) to engage your students with math content and support their development of the CCSS mathematical practices. Learn practical strategies for integrating sims into your teaching and designing sim-based activities. Videos of teacher practices for effective sim use and lesson plans will be shared.

## New HTML5 Simulations: Molecule Shapes and Molecule Shapes: Basics

Now both Molecule Shapes and Molecule Shapes: Basics are available in HTML5. Explore molecule shapes by building molecules now with your fingers! Learn how molecule shapes change and what affects them.

## New #HTML5 Least-Squares Regression Simulation

In the new #HTML5 Least-Squares Regression simulation, students can flexibly explore ideas related to correlation, best-fit lines, residuals, and outliers. Build a data set or use real-world data to discover the meaning of a correlation coefficient and determine when a linear fit is reasonable.

Least-Squares Regression is appropriate for any grade level that is studying scatter plots, best-fit lines, regression, or correlation, and is specifically aligned with Common Core State Standards in high-school mathematics.

## PhET Downtime: Friday, March 20, 2015 10 PM to Saturday, March 21 8 AM

PhET (http://phet.colorado.edu) will be unavailable from Friday, March 20 at 10:00 PM Mountain Daylight Time until Saturday, March 21 at 8:00 AM Mountain Daylight Time due to necessary maintenance performed by the University of Colorado Office of Information Technology.

We apologize in advance for the inconvenience and thank you for your patience.

## 2015 OER Week March 9-13, 2015

PhET is one of many providers of “Open Educational Resources” (OER) and is a big supporter of the larger open education movement. This week brings many opportunities to learn more about OER projects and the opportunity for OER to impact teaching and learning worldwide. See their list of events here http://www.openeducationweek.org/event/ And, use the hashtag: #openeducationwk on Facebook and Twitter to spread the word of OER!

## How Red, Green and Blue Make A Rainbow…or a Dress

With the Internet all abuzz over the color of #TheDress, the time is perfect to introduce students to how red, green and blue make up the colors of our world. Learn about how red, green and blue make a rainbow in the Color Vision sim.

## Working with Fractions?

Try the #HTML5 tablet/browser-compatible Fraction Matcher simulation. A great way to improve fraction skills for the younger student. Match shapes and numbers to earn stars in this fractions game. Students can challenge themselves at different levels, collecting stars as they improve their fraction skills. Choose between the “Fractions” and “Mixed Numbers” tabs for more learning fun.

## New #HTML5 Reactants, Products and Leftovers Simulation

With the new #HTML5 Reactants, Products and Leftovers, you can create your own sandwich and then see how many sandwiches you can make with different amounts of ingredients. Do the same with chemical reactions, relating how making sandwiches is to chemical reactions. Then play a game to test your understanding of reactants, products and leftovers.