Reviving species that have been wiped out (sometimes due to mankind) is not entirely fantasy– in fact, quite a few species can be brought back from extinction, through methods including cloning and... Read more »
Hank guides us through the process of natural selection, the key mechanism of evolution. Crash Course Biology is now available on DVD! http://dftba.com/product/1av/CrashCourse-Biology-The-Complete-Series-DVD-Set Like CrashCourse on Facebook: http://www.facebook.com/YouTubeCrashCourse Follow CrashCourse on Twitter:... Read more »
