First video game: https://en.wikipedia.org/wiki/First_video_game
Oldest proof of life on earth: http://phys.org/news/2013-01-earliest-evidence-life-billion-years.html, https://en.wikipedia.org/wiki/Evolutionary_history_of_life
Blue blood in veins: http://www.livescience.com/32212-if-blood-is-red-why-are-veins-blue.html, http://scienceblogs.com/scientificactivist/2008/04/17/why-are-veins-blue/
Sweating: http://www.antiperspirantsinfo.com/en/all-about-sweat/why-do-we-sweat.aspx
Drugs: http://headsup.scholastic.com/students/more-facts-about-how-drug-abuse-puts-your-whole-body-at-risk
Clouds in the sky: http://www.scientificamerican.com/article/why-do-clouds-float-when/
Diabetes: http://health.howstuffworks.com/diseases-conditions/diabetes/diabetes.htm
Colourful universe: http://www.universetoday.com/117215/what-does-space-really-look-like/
Mermaids: https://en.wikipedia.org/wiki/Spawn_(biology),
Pluto: http://science.howstuffworks.com/pluto-planet.htm