Top 5 Science Stories of 2012! Trace counts down the biggest stories in a year full of amazing scientific advancements and acheivments.

news.discovery.com/human/mayan-doomsday-not-apocalypse-121121.html
news.discovery.com/mars/
news.discovery.com/stratos
news.discovery.com/hurricanes/
news.discovery.com/earth/costa-concordia-cruise-ship-disaster-120203.html


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