The End of Night

Kat and Chris are turning the lights down low in the search of darkness. 80% of Europeans and Northern Americans now can't see the Milky Way. But does a little light pollution really matter? It doesn't harm anyone, or does it? Plus in the news, with the US presidential elections fast approaching, we see what we can learn from animals when it comes to picking a leader. And, do you really lose most of your heat through your head?