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.
American black bears give birth while in winter dens near the beginning of the year, late January or early February.Cubs have high mortality, but if the cubs survive, they will stay with their mother for a year and a half, until June or July of their second summer.Because of this, female bears usually give birth only every other year.ubs have high mortality, but if the cubs survive, they will stay with their mother for a year and a half, until June or July of their second summer. Because of this, female bears usually give birth only every other year.