This document discusses the differences in growth and maturation between cows and humans. Cows experience rapid growth over 2 years to reach maturity, while humans grow slowly over 20 years. The protein content in mother's milk gradually reduces, though nature ensures it provides sufficient nutrition. Consuming cow's milk provides excess protein that human physiology is not adapted for. Osteoporosis is common in populations that consume large amounts of cow's milk, while it is rare in populations that consume little milk. The document questions whether humans are smarter than nature by consuming cow's milk long after weaning.