The embryos of tiger sharks fight each other while in their mother's womb, the survivor being the baby shark that is born.
Ants do not sleep.
Nearly a third of all bottled drinking water purchased in the US is contaminated with bacteria.
Rats multiply so quickly that in 18 months, two rats could have over 1 million descendents.
An Astronaut can be up to 2 inches taller returning from space. The cartilage disks in the spine expand in the absence of gravity.
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