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Harmless 4 year s ago
The expression "rare as a hen's tooth" comes from the fact that chicks in the egg have what is known as an "egg tooth" on their beak which helps them break out of the shell. They lose it almost immediately after hatching. Hence the expression.
MISCONCEPTION: DOGS ARE COLORBLIND
Their eyes have two types of color receptors, or cones, as opposed to the three that the average person does. Dogs can see yellow and blue, which makes them colorblind in the same way that some humans are colorblind.
