Artist Bob Miller's Light Walk at the Exploratorium will change the way you look at light, shadow, and images.

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How to Make a Pinhole Projector There are safe ways to view the sun. The simplest requires only a long box (at least six feet long), a piece of aluminum foil, a pin, and a sheet of white paper. The ...

It might seem obvious to say that earthquakes do most of their damage by shaking the ground. But groundshaking is actually a complex phenomenon. Engineering the seismic safety of a structure involves ...

The Big Bang theory raises some important questions about the fundamental nature of the universe: Will the expansion of the universe, set in action by the Big Bang, continue forever? Or will gravity ...

A bicycle wheel acts like a giant gyroscope. A spinning bicycle wheel resists efforts to tilt it and point the axle in a new direction. Any rapidly spinning wheel exhibits this gyroscopic property—and ...

Climate change models predict that some parts of the world will get more rain and snow than the historical average, while others will get less. Different climate models give slightly different ...

Global Climate Change Explorer: Land and Living Systems As climate change raises temperatures and changes weather worldwide, it’s also changing the rules of the game for living things on land. Spring ...

Note that as the distance of the planet from the sun is increased, the period, or time to make one orbit, will get longer. Kepler didn't know the reason for these laws, though he knew it had something ...

In Navajo (Diné) tradition, the eclipse marks a sacred time. Solar eclipses are compelling astronomical events that connect us to the Sun and the Moon in powerful ways. Annular or total solar eclipses ...

Now we have great tools like spreadsheets to do the numerical computations for us. Below you can download OpenOffice (or Libre Office), Apple Numbers or Excel format files. In these spreadsheets, you ...

Not all shadows are black. When lights of different colors shine on the same spot on a white surface, the light reflecting from that spot to your eyes is called an additive mixture because it is the ...