Fibonacci series

I was leafing through a small textbook about Fibonacci sequence (1,1,2,3,5,8,13, 21, 34, 55… ) and its many practical applications. For example, you can quickly do an approximate conversion between miles and kilometres. 

Each number in kilometres is approximately equal its preceding number in Miles. Ex: 5 kms approximately equals 3 miles, 8 kms = 5 miles, 13 kms = 8 miles and so on. 

And by the way, Fibonacci series was originally discovered in India, possibly by Pingala or Virahanka.