Just getting to the center of the Earth and surviving is impossible. The Earth’s core is about 9,000°F—as hot as the sun’s surface—and would instantly roast anyone who found himself there. Then there’s the pressure, which can reach roughly three million times that on the Earth’s surface and would crush you. But let’s not sweat the details. Once you arrive in the center of the Earth, the physics gets really interesting.
For an hour and a half or so earlier this month, 30 teachers from Ohio middle schools weighed nothing at all. The same went for me; for TV personality "Science Bob" Pflugfelder; and for 2,016 optic-orange ping-pong balls.
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.