A lab experiment to extract DNA from an onion using household equipment. Procedure includes both videos and pictures.

Learn about the important role the petri dish plays in enabling the study of microorganisms, some of its uses, and how petri dishes are used.

The mass spectrum of a material, deduced using a machine called a mass spectrometer, reveals how many isotopes of a given element are to be found in the material. See here what these spectra look like and how they are useful. (Java...