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The speed of sound in water is about four times faster than in air.

The speed of sound in water is about four times faster than in air. Since water is more dense than air, sound travels with greater ease.

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The average snow flake falls at a speed of 3 to 4 miles per hour. It can take up to an hour to reach the ground.

The fastest plane in the world is NASA's Boeing X-43A Scramjet, flying in the record books at a speed of Mach 9.6, or 7,350 mph (11,760 km/h).

The distance from the Earth to the sun is 92 million miles (146 million km). Even at the incredible speed of light, it takes 8 minutes for the sun's light rays to reach us once they leave the sun.

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The most powerful tornado ever measured produced speeds in excess of 480 km/h, or 300 miles/hour.

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