An experiment revealed that chomping on slightly tougher material requires markedly more energy. Spending less time on mastication may go hand in hand with human evolution. By Kate Golembiewski Humans ...

In contrast to ruminants, horses chew their food only once -- but with the same regular, rhythmic movements as cows, who ruminate their food after eating. Herbivores digest their food much better if ...

This article was published in Scientific American’s former blog network and reflects the views of the author, not necessarily those of Scientific American About a century ago, a new craze gripped the ...