Evening Republican, Volume 21, Number 293, Rensselaer, Jasper County, 16 December 1918 — Popular Science. [ARTICLE]

Popular Science.

The heart weighs only about half a pound. Yon should breathe once every three seconds. You consume about 18 pints of air per minute. The temperature of the body is maintained evenly during health. The heart pumps the blood a distance of almost 385 miles in one year.