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.
Cheetahs generally give birth to as many as eight cubs, with the mother selecting a secluded spot for birthing. Cubs will not open their eyes for a couple weeks and are virtually helpless. The mother leaves her cubs hidden as she hunts until they are old enough to follow along â usually by the age of 6 weeks. Cheetah cubs suckle their mother for up to 3 months but will begin to eat some meat when they are as young as 3 weeks. According to the San Diego Zoo, cheetahs are a very vocal species, and they use a chirping sound to call to their cubs. This sound is called a chirp call, and it is a lot like a dog's bark.