10 – http://wonderopolis.org/wonder/what-was-before-dinosaurs/
9 - https://www.quora.com/What-was-the-first-ever-anime-made
8 - http://www.infoplease.com/spot/valentinesdayhistory.html
7 - http://www.disabled-world.com/health/dermatology/hair/gray-hair-causes.php
6 - https://pubs.acs.org/cen/whatstuff/stuff/7646scit2.html
5 - http://electronics.howstuffworks.com/gadgets/high-tech-gadgets/virtual-world.htm
4 - http://scienceline.ucsb.edu/getkey.php?key=3316
3- http://phys.org/news/2011-09-humans-naturally-cooperative-altruistic-social.html
2 - http://www.smithsonianmag.com/science-nature/why-fire-makes-us-human-72989884/?no-ist
1 - https://en.wikipedia.org/wiki/Earth