1.   Sound travels four times faster in water than in air.

2.   When sound travels through water, strange things can happen.

3.   Because sound travels so much slower than light, witnesses saw streaks of burning debris before hearing the explosion, causing the misslelike illusion.

4.   Because sound travels faster in warm water, they can detect global warming by measuring the speed of low-frequency underwater signals.

5.   For example, under the right atmospheric conditions, sound can travel unusual distances.

6.   It is seen and heard at exactly the same moment, even though sound does not travel in empty space.

7.   Luckily, sound cannot travel through the vacuum of space.

8.   Namely, that sound travels much slower than light.

9.   Sound can travel through water for enormous distances, prevented from dissipating its acoustic energy by boundaries in the ocean created by water layers of differing temperatures and densities.

10.   Sound travels funny.