Biology

Khan Academy

Charles Darwin Origin of Species by means of natural selection
6th London Edition by Charles Darwin.

Lead Poisoning and Gold part of the topic of Biological Environmental Poisoning.
Environmental Poisoning can have tragic consequences.
Worldwide education on these issues is important.  There is still a lot of work to be done to create solutions to this and other issues.

John D. Liu on Permaculture and rehabilitation of large scale ecosystems.

Genetics – Greatest Discoveries with Bill Nye. Science Documentary HD