Matter is made up of small particles called atoms. Atoms can exist on their own or together as molecules. Atoms are very small and around 100,000,000 of them end to end would measure 1 centimetre.

BOISE, Idaho — After the 4th of July brought Boise its hottest day of the year so far, the heat doesn't look to let up much for the first full week of the month, as daytime highs are expected to ...