Cold germs from someone’s nose or cough can live on surfaces for hours to days, depending on many factors. Learn which surfaces to avoid or clean.

A single bacterium consists of just one cell. Not all bacteria are harmful. There are different unicellular organisms and types of bacteria. Yeast are unicellular fungi. They are used by brewers ...

A single bacterium consists of just one cell. Not all bacteria are harmful. There are different unicellular organisms and types of bacteria. Yeast are unicellular fungi. They are used by brewers ...