It is well-known that those who have charge of young infants, that it is difficult to feel sure when certain movements about their mouths are really expressive; that is when they really smile. Hence I carefully watched my own infants.… — Charles Darwin Copy Share Image
“If energy stays out for more than two weeks, most infants under age one will die of starvation because of their need for formula. If energy remains down for a year, about nine out of ten people of all ages… — James Barrat Copy Share Image
