A lead-acid battery is a type of rechargeable battery, invented in 1859. It uses lead plates (electrodes) submerged in ...

Chalk is a fine-textured form of limestone. It is composed of several tiny fragments of the calcite shells or skeletons of ...

The type of formula fed to infants influences how quickly they gain weight, according to a new study. This is important, the researchers say, because rapid weight gain during the first year increases ...