An ion is an atom or molecule in which the total number of electrons is not equal to the total number of protons, giving it a net positive or negative electrical charge. The name was given by physicist Michael Faraday for the substances that allow a current to pass ("go") between electrodes in a solution, when an electric field is applied. It is the transliteration of the Greek participle ἰόν, ión, "going".

An ion consisting of a single atom is an atomic or monatomic ion; if it consists of two or more atoms, it is a molecular or polyatomic ion.

An anion (−) ( /ˈæn.aɪ.ən/ AN-eye-ən), from the Greek word ἄνω (ánō), meaning "up", is an ion with more electrons than protons, giving it a net negative charge (since electrons are negatively charged and protons are positively charged).

A cation (+) ( /ˈkæt.aɪ.ən/ KAT-eye-ən), from the Greek word κατά (katá), meaning "down", is an ion with fewer electrons than protons, giving it a positive charge. Since the charge on a proton is equal in magnitude to the charge on an electron, the net charge on an ion is equal to the number of protons in the ion minus the number of electrons.

Bruce Harold Lipton (born October 21, 1944) is an American developmental biologist, who is best known for promoting the idea that genes and DNA can be manipulated by a person's beliefs. He teaches at the New Zealand College of Chiropractic.

Lipton was born in Mt. Kisco, an affluent town in New York. In 1966 he received a B.A. in Biology from C.W. Post Campus of Long Island University and then his PhD in developmental biology from the University of Virginia in 1971.

In 1973 he taught anatomy as an Assistant Professor at the University of Wisconsin School Of Medicine before coming to St. George's University School of Medicine, where he became a Professor of Anatomy for 3 years. From 1987 to 1992 he was involved in research at Penn State and Stanford University Medical Center. Since 1993 he has been teaching in non-tenure positions at different universities. His publications consist mainly of research on the development of muscle cells.

Lipton has appeared on several radio shows as well as The Elaine Smitha Show and The Joe Rogan Experience podcast episode 165.