...... at least according to the Landauer Limit. A wonderful bit of maths and entirely useless until you get to computers. The Landuaer Limit suggests that the minimum amount of energy required for any computation (creating or destroying one (information) bit) is 2.85 zJ (zepto Joules, 1 x 1021 Joules or 0.000000000000000000000285 Joules). To give an idea of how much that is, a teaspoon of sugar contains about 64000 Joules of energy. That mean that if you manage to forget 22.5 million million million million things, you can work off the cup of tea you just had! A Big Mac, on the other hand contains about two million Joules of energy requiring about 700 million million million million bits of forgetting.
What was I on about?