Why we haven't found aliens (pt 1)

Numbers like 100 billion or even 100 billion trillion, aren't really that big when compared to some everyday statistical numbers.

E.g. Take something as common as shuffling a stack of 52 cards. The odds of shuffling a pack of cards in the same order, twice is 1 in 8 x 10^67.

That number is so insane, that you can accept a stack of 52 cards will never ever be shuffled to result in the same order twice.

That number is this many times bigger than all the stars in the entire observable universe combined: 1000000000000000000000000000000000000000000000000000000000000 times bigger.

Compared to the number of earth sized planets in our galaxy, the comparison is even more insane. 

And that's only when you need 52 things to land in the same order. Now imagine a situation where there are more than 52 things involved.

70 billion trillion stars in the observable universe isn't really a big number.

When it comes to the Drake equation, it's possible that we're facing such insane numbers. Because of FL.
But we don't know, because we only have a sample size of one.