He also wrote this hmmm!

The rate of energy transfer to the target is vastly more important than the quantity of energy transferred. This is the technical definition of power. Anyone sunbathing on a clear summer day at the beach will receive an irradiance equivalent to over 4600 ft-lbs every minute! Eventually, this bombardment by extremely high velocity particles will result in sunburn, but the body can withstand the energy it receives because it is spread over a large area and arrives at a relatively slow rate (compared with bullets). The power and intensity (power per unit area) is much less than ballistic events.