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  1. Did you know white cats with blue eyes are usually deaf
  2. Did you know wind doesn`t make a sound until it blows against an object
  3. Did you know there is no sound in space
  4. Did you know sound travels 4.3 times faster through water than in air
  5. Did you know to crack a whip the tip must be travelling faster than the speed of sound
  6. Did you know dolphins can hear underwater sounds from 24km (15miles) away
  7. Did you know most cows produce more milk when they listen to music
  8. Did you know elephants communicate in sound waves below the frequency that humans can hear
  9. Did you know sound travels 15 times faster through steel than air
  10. Did you know a cat can keep purring while inhaling and exhaling
  11. Did you know a whip makes a cracking sound because its tip moves faster than the speed of sound
  12. Did you know sound travels 10 times faster through granite than air
  13. Did you know dolphin's can detect underwater sounds from 24 km (15 miles) away
  14. Did you know when baby polar bear cubs are born they cannot see or hear for their first month
  15. Did you know akousticophobia is the fear of noises
  16. Did you know melophobia is the fear of music
  17. Did you know lion's can't roar until the age of 2



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