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.
Approximately 630,000â725,000 American black bears live in 42 states. They also inhabit 11 Canadian provinces. Grizzly bears (also known as brown bears) and polar bears inhabit North America too. The most common bear in Idaho is the Ursus Americanus, otherwise known as the American black bear.