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.
How long is a mother polar bear pregnant for? The exact/accurate gestation period is not known but it is around 8 months. Each litter has 2 cubs and sometimes even 3. Cubs weigh around 10 to 15 kilograms (22 to 33 pounds)â¦ at birth. Cubs stay with the mother for around 2 to 3 years of their life and then go away.