Olympic Games
It's the Olympics, and in the great tradition of "topical videos" (or ambush marketing, as the IOC calls it), I've released a Numberphile video about the hardest question posed at the International Math Olympiad (from back in 1988).
And here are some Olympic videos I've done in previous years across all channels...
And if that is not enough for you, here is whole playlist of videos we made for Periodic Videos during a trip to Rio!