Einstein's theory of relativity, first formulated in 1905, offers a profound explanation of the behavior of objects in space and time. While its applications are often associated with phenomena like ...

Help sort shapes in a shape factory. Look at examples of shapes to see if they belong in a polygon group, or set. Examine examples of shapes that do not belong in the set. What features do you think ...

After doing the Shapes Lab, have kids do this hands-on activity to apply what they've learned about shapes. Demonstrate how to connect straws with paper clips. As groups finish building their shapes, ...