75,000 years ago, the human race was on the brink of extinction. The cause was the Toba supervolcanic eruption, which had plunged the earth into a volcanic winter and killed all but a few thousand remaining humans. This moment was the closest we have come to extinction since our species began. Even smaller volcanic eruptions have lead to such cheerful-sounding phenomena as "The Year Without a Summer".  Now, the question has to be asked: could this happen again? And how likely is it to occur during our lifetimes? On this week's TEOTWAWKI special of Physical Attraction, we're going to be talking about the threat from supervolcanic eruptions.

How are you feeling about the countdown so far? Let us know over on Twitter @physicspod, or via the email, physicspod@outlook.com