lecture was on asteroids
http://en.wikipedia.org/wiki/Asteroid_impact_avoidance
http://en.wikipedia.org/wiki/Chicxulub_crater
http://geology.com/meteor-impact-craters.shtml
http://www.divinecaroline.com/22321/79258-probably-won-t-happen-putting-odds
http://en.wikipedia.org/wiki/Outer_space
http://www.astronomynotes.com/solfluf/s5.htm
http://www.newser.com/story/111480/scientists-spar-over-asteroid-apocalypse-in-2036.html
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