Videos of the day -- the natural world and its challenges

Rather than re-embed all of these, I'm just going to refer you to Crazy Eddie's Motie News, which has them all posted already.  First, these eight clips on nature and biology, which have spectacular visuals -- though the very last one may not be for all tastes.  Then there are these, looking at a wider range of scientific issues (including the one above).  All of them are from longer works which you may well want to seek out and watch in full.