Various types of model trains are displayed at the show room of Broadway Limited Imports, an import firm in Ormond Beach of Florida, the United States, June 6, 2019. (Xinhua/Zou Guangping) ORMOND ...
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.
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