Dr. Ferbergerral had a new type of bacteria. Every minute, the bacteria in the tray would split in two, creating two new bacterias.
Dr. Ferbergerral went out for lunch at twelve o'clock PM. He was a very precise man. At one o'clock PM, he checked back on the bacteria and got a real shock. "Oh, no!" he exclaimed. "The tray is full of bacteria!"
At what time was the tray half full? Post your answer in a comment. If you are trying to solve this puzzle, please do not look at the comments.
I got this from a card deck of math puzzles. I may post more math puzzles regularly.
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