Scorpions: Friend or Foe?

Scorpions: friend or foe thumb

Did you know a scorpion can control how much venom it produces in its stinger? Meet a scientist who's discovered more than 70 species of scorpions and find out what he's learned about them. 

Scorpions: Friend or Foe? (SuperScience)

Scorpions: Friend or Foe? (Science World)