We live in a test tube. Never before have humans been exposed to so many chemical and toxins.

In 1935, about 100 cane toads were brought in from Hawaii to help sugar cane farmers combat a destructive beetle. Some estimates put the current cane toad population in Australia at 200 million. Their powerful toxins have killed huge numbers of native animals.

Phosphorus provides nourishment for cyanobacteria (blue algae) which multiply and release toxins.

It feels like carbohydrates are toxic like the toxins contained in invertebrates in the world's oceans.

The toxin that causes diphtheria is produced by a normally benign bacterium when infected with a certain virus.

Fructose is a toxin.

Plants produce toxins to defend themselves from predators.