We live under constant pressure, physically, from the weight of the atmosphere. We can demonstrate how much by imploding a can with nothing but atmospheric pressure. It turns out this pressure is the weight of several elephants pushing on us all the time.

Here's a simple activity that demonstrates both exponential growth and decay by folding a piece of paper in half a many times as possible. Also, today I'm joined by some special guests, Hansel and Pretzel, the science bunnies. I could only do it 6 times, can you get higher?

I wanted to demonstrate how anyone can use a little science to drive change. This is a simple science experiment that started with an observation - there's always a little water left in a water bottle. The result is if 1/4 of all discarded water bottles have a small amount of water left in them and the cap is not taken off, then we are losing an Olympic-sized swimming pool every 12 hours. That's the amount of water needed for 8 million people lost every year. Not good, but people don't know. See for yourself and spread the word.

Here's a method to always win at the game, I Spy, and at the same time secretly learn about something called exponential decay. A mathematical concept that applies to everything from the cooling of a cup of coffee to radioactivity decay.