Can you explain why it's always 1 ? ?
pick any number.
if that number is even, divide it by 2.
if it's odd, multiply it by 3 and add 1.
now repeat the process with your new number.
if you keep going, you'll eventually end up at 1.
every time.!

The thing is, they've never been able to prove that, lol. (: 

there is no  special number out there that never leads to 1. It's possible that there's some really big number that goes to infinity instead, or maybe a number that gets stuck in a loop and never reaches 1. But no one has ever been able to prove that for certain.