You’ve probably heard of the chemical calcium in milk. But calcium shows up in lots of other stuff too. For example, the hard part of your bones and teeth is made from calcium connected to a chemical ...

Sodium becomes a positive ion and chlorine becomes a negative ion. The positive and negative ions attract each other and form the ionic compound sodium chloride. One calcium and two chlorine atoms are ...

A new study led by researchers at the Earth-Life Science Institute (ELSI) at Institute of Science Tokyo has uncovered a ...