It's easy to think of some pretty nasty substances. Botulinum toxin, a poison produced by Clostridium botulinum bacteria, is the most toxic naturally occurring substance on Earth, blocking nerve ...

About 85 miles southwest of Salt Lake City is the US government's top-secret bioweapons lab ... And it tests some of the deadliest chemical, biological, radiological, and explosive hazards ...

Their venom is considered to be among the most deadly in the world ... which are triggered not by touch but by the presence of a chemical on the outer layer of its prey. Box jellies are highly ...