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.
1 Black bears prefer heavily wooded areas and dense bush. 2  There are no reliable estimates of the total black bear population in North America because of the animalsâ secretive nature, but populations are believed to be about 600,000, with more than 380,000 in Canada. Bears can do both of these things better than you! 2  If the bear begins to follow you, drop something (not food) to distract it. 3  Be cautious around females with cubs. 4  If the bear attacks you, fight back and make a lot of noise.