References
10 – phobias - http://www.phobics-society.org.uk/causes-of-phobias/
http://www.scientificamerican.com/article/why-do-we-develop-certain-irrationa/

9 – lift weight - http://www.bodybuilding.com/fun/how_gymnasts_train.htm
http://travelstrong.net/build-muscle-without-weights/

8 – different blood-types - http://www.livescience.com/33528-why-blood-types-exist-compatible.html
http://www.scientificamerican.com/article/why-do-people-have-differ/

7 – 8 hours sleep - https://www.quora.com/Despite-sleeping-for-7-8-hours-every-night-I-feel-extremely-sleepy-each-morning-How-do-I-change-this
http://www.huffingtonpost.com.au/entry/tired-after-long-sleep_n_6800880
http://www.alaskasleep.com/blog/why-tired-after-full-nights-sleep

6 – oldest boardgame - https://en.wikipedia.org/wiki/Senet#cite_note-Soubeyrand-6
http://www.gamecabinet.com/history/Senet.html
https://www.historyanswers.co.uk/ancient/the-biggest-party-in-history/

5 – red eyes - https://www.quora.com/Why-do-some-people-have-red-eyes-in-pictures-and-some-do-not
http://www.allaboutvision.com/resources/red-eye-photo.htm
https://en.wikipedia.org/wiki/Red-eye_effect#Causes
4 – underwater city - http://www.bbc.com/future/story/20130930-can-we-build-underwater-cities
https://www.reddit.com/r/explainlikeimfive/comments/3moh88/eli5_underwater_cities_are_they_possible_and_if/
https://www.fastcoexist.com/3040294/look-at-the-crazy-designs-for-the-worlds-first-underwater-city
https://www.quora.com/Is-it-viable-possible-to-build-an-underwater-city

3 – owl head turn - http://www.livescience.com/26771-how-owls-rotate-heads.html
http://www.hopkinsmedicine.org/news/media/releases/owl_mystery_unraveled_scientists_explain_how_bird_can_rotate_its_head_without_cutting_off_blood_supply_to_brain

2 – sleep paralysis - http://www.nhs.uk/Conditions/Sleep-paralysis/Pages/Causes.aspx
http://www.livescience.com/50876-sleep-paralysis.html
http://www.webmd.com/sleep-disorders/guide/sleep-paralysis#1

1 – humans - https://en.wikipedia.org/wiki/Human#Etymology_and_definition
https://www.quora.com/Why-are-we-called-humans