Why Do We Have Two Nostrils?

LINKS:   / tweetsauce     / vsaucegaming   music by:    / jakechudnow   Sound localization: http://www.diracdelta.co.uk/science/s... Depth perception: http://nathanclarkecommunication.wiki... Why do we have two nostrils instead of one? http://bit.ly/QXHsLZ http://news.stanford.edu/news/1999/no... What does space smell like? http://www.popsci.com/science/article... http://dsc.discovery.com/space/im/sme... Polycyclic Aromatic Hydrocarbons: http://en.wikipedia.org/wiki/Polycycl... Raspberry and Rum in space: http://npr.tumblr.com/post/2691176951... olfactory fatigue: http://en.wikipedia.org/wiki/Olfactor... Memories and smell: http://psychology.about.com/od/memory... Westermarck effect: http://en.wikipedia.org/wiki/Westerma... Name for a person who can't smell: http://en.wikipedia.org/wiki/Wikipedi...