[londons_explore]

> At age 30 the total energy use of the brain sums up to about 5000 Wh,

That doesn't sound right... 30 years * 20 Watts = 1.9E10 Joules = 5300 kWh.

[cynusx]

Where did you get the 20 Watt from?

My number is based on calorie usage

[cynusx]

oh ok, I used 400 calories/day and not 400 kcal/day.

Yea, then the numbers are off by 1000

[1992spacemovie]

I respect that you replied to the comment and owned your math error :) The rest of your comment is an interesting observation. Never thought about it starting out at the cal level.