Deep Fact

The average depth of the ocean floor is 12,000 feet.

(according to my trivia calendar and Wiki, but NOAA says "about 14,000 ft.")

Oceanic divisions - Click image for larger view

Lightning vs The Sun

Lightning is five times hotter than the sun.

Yes, it's true.  A bolt of lightning can reach temperatures of roughly 30,000 kelvins (53,540 degrees Fahrenheit), while the surface of the sun is 6,000 kelvins (10,340 degrees Fahrenheit).

Pendulum Waves

From the description under the video: Fifteen uncoupled simple pendulums of monotonically increasing lengths dance together to produce visual traveling waves, standing waves, beating, and (seemingly) random motion.
 

Now watch it done with bowling balls!