A new study indicates that Americans gained up to 15 IQ points after the addition of iodine to salt became mandatory. In an effort to prevent goiter related to iodine deficiency, authorities ruled that iodine be added to U.S. salt products in 1924. The iodine, in addition to eliminating goiter, appears to have had an unexpected result: smarter Americans.
At peak lactation a black bear cub consumes about 30 ounces of milk a day, and a brown bear cub takes about 45 ounces. Thatâs per cub, so a mom with a litter of two or three cubs could be producing three or four quarts per day â a difficult metabolic feat to sustain.
When black bear cubs emerge from the den at about three months of age, they weigh about 4 - 8 pounds (1.8 - 3.6 kg) and are able to follow their mother around in search of food (Rogers 1981). At ten weeks of age, grizzly bear cubs weigh 10 - 20 pounds (4.5 - 9.0 kg) (Brown 1993).