What are some mind-blowing facts that sound like 'BS', but are actually true?

The most toxic substance known is botulinum toxin. 100 nanograms is enough to kill a full-grown man; 1kg (2 pounds) would be enough to wipe out the entire human race.

It is secreted by a bacterium, C. botulinum. It causes muscle paralysis by cutting off proteins which normally enable vesicle function at the neuromuscular junction.

Millions of people willfully have botulinum toxin injected into their faces every year, under the trade name Botox®.

Source: Botulinum toxin

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