Medical researchers want to keep astronauts' hearts healthy in space, so they looked to the sporting world to find the best excercise. Hear about why rowing is best.

A British student wonders how the energy issue will impact our planet. Yale professor and 'energy futurist' Arnulf Gruber responds, and talks about what kids can do to help.

Imagine sinking your teeth into a nice juicy burger...grown in a test tube. An expert explains why animal-free meat could be better for your health, and better for the environment. Listen to Jason Matheny of New Harvest, a research organization in Baltimore.

In the future, an elite class might be able to enhance their physical bodies and their senses. Rosalyn Berne of the University of Virginia talks about how nanotechnology might redefine what it means to be human. Read more about a nano-enabled future.

Bartlett says the most important thing we are ignoring is the simple mathematical principle of exponential growth. Find videos about it here.

As NASA prepares to return to the moon by the year 2020, a scientist is studying a space hazard - lunar dust.

Just about every piece of fruit has a little sticker on it, and every vegetable has a scanning label associated with it. Learn how to read produce labels.

The atoms in the body of an average person corresponds to about 1.6 gigatons of TNT in energy. The likelihood of spontaneous explosion is low, similar to that of the Large Hadron Collider to cause any harm.

Sweet potato tops corn in ethanol fuel study. We should ramp up sweet potato production for ethanol and put more corn back into the food supply.

Bruce Rittmann talked about creating microbial fuel cells that use organic waste to create energy. Read more in using bacteria to make energy from waste.