Riddle
A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?
Try it first, then reveal and read the payoff.
Explore more on the Nature Riddles hub (with answers).
Answer
Take a moment to solve it, then reveal the answer below.
Why it works
The trick is whether the situation repeats after the first step or the list counts the same item more than once.
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