When will objects float and when will they sink? Learn how buoyancy works with blocks. Arrows show the applied forces, and you can modify the properties of the blocks and the fluid.
Here’s a great lesson on reaction rates from Ms. Emily Firchau at Arapahoe High School. Thanks Emily!
http://phet.colorado.edu/en/contributions/view/3147
Build a gene network! The lac operon is a set of genes which are responsible for the metabolism of lactose in some bacterial cells. Explore the effects of mutations within the lac operon by adding or removing genes from the DNA.
We just published an updated version of the Greenhouse Effect. In this version, we restored cloud reflection and ice reflection features. (Thanks to the user who reported this bug!) You can now see how clouds and ice influence the amount of sunlight reaching the surface. We also fixed a control-panel layout issue occuring in the Japanese translation.
