A rubber ball is tossed off the top of a 90 foot building. Every time it bounces, it goes back up half way

Math Riddle:  A rubber ball is tossed off the top of a 90-foot building. Every time it bounces, it goes back up halfway. How many bounces will the ball take before it stops?

Answer: The correct answer is the answer is infinite, in a gravity-free world. But of course, gravity will eventually stop it.

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