A piece of wood at 130°C can be picked up comfortably, but a piece of aluminum at the same temperature will give a painful burn. Why is this?

Estimate the amount of heat necessary to raise your body temperature by one degree Fahrenheit.

It might be useful (say, for heat shielding) to have a material that could absorb heat without any change to its temperature. Is this possible? Under what conditions?

Estimate the amount of sweat that must evaporate to cool your body by one degree Centigrade.