Cuisine varies greatly around the world, but the basic ingredients that sustain humans are pretty similar. We eat a lot of corn, wheat, rice and other simple crops. Read on to find out which foods top the list of most important worldwide, listed by annual production and average yield in 2008.
Howler monkeys are widely considered to be the loudest land animal. According to Guinness Book of World Records, their vocalizations can be heard clearly for 3 mi (4.8 km). The function of howling is thought to relate to intergroup spacing and territory protection, as well as possibly to mate-guarding.
MOST OF THE TIME, it's in an animal's best interest to be undetectable, but sometimes it's useful to be loud-very loud. While a normal human conversation registers at about 60 decibels (dB), some animals can screech, scream and holler much louder than a subway train (100dB). The human threshold of pain is 120, and at 160 your eardrum will rupture, but many loud animal calls are not designed for human ears.