Say there are 100 bugs flying outside your cracked window. After 1 hour, one of those bugs manages to find its way through the crack.
That’s 1% of the population that has managed to find the crack in 1 hour.
Now consider the situation from the inside — if it took 1 hour for 1 bug of the 100 to find its way through, what chance does that single bug have to find the crack to escape?
This is a situation very closely related to entropy, and you might find [Maxwell’s Demon](https://en.wikipedia.org/wiki/Maxwell%27s_demon) an interesting concept to read up on.
It might only appear they have an easier time getting in rather than out since you are only analyzing the few that found their way in making it appear to have a 100% success rate.
Judging by the handful of birds that have died trying to fly into my large living room window, and the fact I have only had a single live bird make it into my house, I think they have just as much trouble coming in as they do going out.
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