10 – Pisa - http://www.softschools.com/facts/wonders_of_the_world/leaning_tower_of_pisa_facts/93/
 9 – Moon - https://www.quora.com/What-would-happen-if-the-moon-fell-to-earth
8 – water - http://www.eatbydate.com/drinks/how-long-does-water-last-shelf-life-expiration-date/
7 – finger prints - https://au.answers.yahoo.com/question/index?qid=20070723183302AA2Khqp
6 – universe - https://www.quora.com/Is-there-anything-bigger-than-the-universe
5 – mirror delay - https://www.quora.com/When-something-reflects-in-a-mirror-is-there-a-delay-in-the-time-for-it-to-reflect
4 – water - http://www.scientificamerican.com/article/why-does-the-ocean-appear/
3 – tree - http://www.nature.com/scitable/blog/our-science/no_trees_no_humans
2 – love/hatred - http://science.howstuffworks.com/life/what-are-emotions.htm
1 – too much oxygen - http://www.scientificamerican.com/article/the-oxygen-dilemma/