And now that We are so deep into sound... 
Here´re some fun facts about it

-white cats with blue eyes are usually deaf
-wind doesn´t make a sound until it blows against an object

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  -there is no sound in space
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  -sound travels 4.3 times faster through water than in air
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•  -dolphins can hear underwater sounds from 24km (15miles) away
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  -most cows produce more milk when they listen to music.
• -elephants communicate in sound waves below the frequency that humans can hear
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  -sound travels 15 times faster through steel than air
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  -a cat can keep purring while inhaling and exhaling
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  -a whip makes a cracking sound because its tip moves faster than the speed of sound
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  -when baby polar bear cubs are born they cannot see or hear for their first month
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  -akousticophobia is the fear of noises
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  -lion's can't roar until the age of 2
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