17 Things you should know about DNA (Infographic). It's the basic building block of all life but what do you really know about it? See how you compare to other humans and crack the genetic code with this informative infographic.
In 1903 these two men had the same name, were sentenced to the same prison and looked exactly like twins, though they were not related. They in fact are the reason that fingerprints are now used when investigating crime.