[avoid3d]

I imagine they meant kw, and that 20w is close enough to 1kw. (btw, I thought the human brain uses a lot more than 20w, maybe 20w in chemical signals, but a lot more in heat?)

[deciplex]

The human body is about 100W-120W, which is about 2000-2500 kcal/day. 20W sounds right.