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 it is time to give birth a lioness leaves her pride and has her lion cubs in dense cover. Mothers give birth to up to 6 cubs at a time but litters of 2 or 3 are more common. Cubs remain hidden for one to two months before being introduced to the rest of the pride. Lion cubs start walking at 10 to 15 days old.