Konigsberg Bridge - Sep 1, 2010

If you enjoy solving puzzles, try the seven bridges challenge.
- This problem helped lead the mathematician Leonhard Euler to develop new mathematical fields, graph theory and topology. See Konigsberg Bridge to learn more.
- Also see the Wikipedia page for variations on this problem.

Splash (fluid mechanics) - Aug 16, 2010

Investigate splashes by dropping different-sized objects into containers of water. Also, you can squeeze drops out of a medicine dropper to make splashes on hard surfaces or on water or milk. (Be sure to do this activity with an adult.) To find out what happens if you drop a half-brick into water, see the photograph at the bottom of Splash (fluid mechanics).

Water on the Move - Aug 1, 2010

Using the instructions on Water on the Move, you can create a model with everyday materials that shows how the water moves as a wave passes by. To visualize the movement of all the water in a wave, see the third animation on this Kettering University page.

Four Color Theorem Intro - Sep 1, 2010

Have you ever wondered how many colors are necessary to make a map? Four Color Theorem Intro can help you figure it out!

- To learn more see this page by Ivars Peterson.

Physicists determine air gives liquids their splash - Aug 16, 2010

What happens when a droplet of liquid lands on a solid surface? What determines the way it splashes? How does what happens depends on the kind of gas and the pressure?

- To find out see Physicists determine air gives liquids their splash.
- And to learn how a raindrop splashes before it hits the ground, visit this New Scientist page.

Tsunami - Aug 1, 2010

Remember the 2004 Sumatra tsunami? Take a look at this Wikipedia photo.

- Visit Tsunami to learn the basic science of these waves, how they are produced, and what role NOAA plays in predicting them and minimizing their damage.
- To learn more, see this NOAA video on its method to forecast tsunamis.