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Damnthatsinteresting

How springs are made (xpost /r/damnthatsinteresting)
Motorcycle accident (xpost /r/damnthatsinteresting)
A beating heart awaiting transplant (xpost /r/damnthatsinteresting)
What color is it? [Xpost /r/Damnthatsinteresting]
How a calligraphy pen works. (X-post /r/Damnthatsinteresting)
Caddisfly larvae (x-post damnthatsinteresting)
Rare Octopus hunts with a butt tap, startling prey into its arms [X-post from /r/Damnthatsinteresting]