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.
Each polar bear litter has 2 cubs and sometimes even 3 cubs. Cubs weigh around 10 to 15 kilograms (22 to 33 pounds) at birth. Size wise, the cubs are only a feet or so in lengâ¦th. They are totally helpless/defenseless at birth and depend entirely on their mother for food and protection.