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.
Average percentage weight that a black bear. loses hibernation: 20-30% of its body weight. Number of teeth you have: Length of time a black bear stays with its. mother: 16 months Length of your foot: Average number of cubs in a black bear litter: Two (2) What. Black bears are born in late January or. February in the den.