Every male human spent the first six to eight weeks in the womb as a female, as the Y chromosome doesn't kick in until then. It is in this time period that breasts begin to develop, which is why men and boys have nipples (I think this may be the same for many mammals, such as dogs).
It took Leonardo da Vinci ten years to perfect Mona Lisa's lips. Also, using x-rays, it was discovered that there are three completely different versions under the Mona Lisa. Another one about this painting: The Mona Lisa has no eyebrows.
There is no dhahabu in the Australian "gold" coin.
A cat has 32 muscles in each...
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