The Fatal Forty: There are approximately 2,000 species of scorpions; of these, around 40 have a venomous sting strong enough to kill a human.
Glow-in-the-Dark?: Scorpions have fluorescent chemicals in their cuticle, or outer shell, which glow in the dark when exposed to a blacklight. Researchers carry hand-held ultraviolet lamps in the field to survey them at night.
