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Yeah Alex,
They discuss a couple of the larger meteor, catastrophic strikes in history throughout the documentary & then go on to discuss the possibilities of a future cataclysmic strike (that was the bit I found a bit scary) & the research that is going on to predict & track those asteroids which have the potential to inflict a catastrophic strike as well as explore some theories on what (if anything) we might be able to do about it..
The full documentary is available on Youtube if you haven't seen it already; it's not bad as documentaries go & very, very interesting stuff..
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