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4%

Counting from 1 to 39, how many 3s will you come across?

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Interesting fact:

When a baby is born, their brain is almost the same size as an adult brain. It reaches its full size at age six. Babies’ brains grow three times in the first year. You may also be interested to know that when you are dreaming, your brain waves are extremely active, more so than in waking life.