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.
Males reach full size at about 8 years of age. Females mate and produce cubs at 5 to 7 years of age, 8 years and older in the boreal forest regions(Ontario). Males weigh up to 280kg(600 pounds), occasionally much more. Black bears live up to 25 years in the wild.