It is not directly and obviously visible because it's not taught in schools. Does the Earth go around the Sun? It took Kepler and Tycho years to prove that out. Many things we assume to be direct and obvious really aren't. It's just that we had to memorize them in school. :)
Authored Comments
It is not directly and obviously visible because it's not taught in schools. Does the Earth go around the Sun? It took Kepler and Tycho years to prove that out. Many things we assume to be direct and obvious really aren't. It's just that we had to memorize them in school. :)
"Why would people just give away the products of so much hard work?"
Because 95% of people will give something back: http://www.guardian.co.uk/science/2012/jul/15/interview-dr-love-paul-zak