second reality

Grace Hopper appears on Letterman and uses a foot-long piece of wire to show how far light travels in a nanosecond.

Giant Bomb interviews John Carmack at E3 2012 about his virtual reality head-mounted display prototype. He demos it and talks about latency, depth and focus problems in VR.

A Gamereactor interview at E3 2012 with John Carmack, who shows his lag-free head-mounted display running DOOM 3 BFG Edition. He discusses what the headset could mean for the games industry.

Gregory Chaitin is interviewed on Closer To Truth about whether mathematics is invented or discovered. He gives a nuanced view that ties the question to the nature of reality.