The Viagra commercial always says "Make sure your heart is healthy enough for sex." That's a really deep question if you think about it in more of a metaphorical way
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Ancient Egyptians braces using gold wire and plates, about 7th century BC
Ever heard of a tank silencer? Yup they got those too.
wildlife.org
Australian ‘firehawks’ earned their name because they will carry fire to new locations to flush out more prey. http://wildlife.org/australian-firehawks-use-fire-to-catch-prey/
