Be sure to note Stephen Hawking at 0:53.
Alternate between this and Where the Hell is Matt?, and you may find enlightenment.
The world is just awesome.
Added bonus: it makes this XKCD make sense.
Apparently geckos stick to walls by way of the van der Waals force. That, plus cockroaches on treadmills, in Robert Full's 2002 TED Talk.