Descriptive of being harmful or bad and not wanted: The exhaust of cars has negative effects or impacts on the environment of many people in several countries.

A presentation of mostly unfounded fears of nanotechnology and how it may affect life on earth in a negative way.

1. An electric charge caused by an excess of negatively charged electrons.
2. The form of electricity in which the electron is the elementary unit.

A cathode; the pole by which electric current leaves the generating source.

The movement of a cell or an organism away from an electrical stimulus.

The movement of a cell or an organism away from an electrical stimulus.

An exaggerated underestimation of oneself.

It is particularly expressed in states of melancholia, characterized by ideas of inadequacy, unreality, and self-accusation.

Any atom or group of atoms that bears one or more positive or negative electrical charges.

Positively charged ions are called cations; negatively charged ions are labeled, anions.

Ions are formed by the addition of electrons to, or the removal of electrons from, neutral atoms or molecules or other ions; by combination of ions with other particles; or by rupture of a covalent bond between two atoms in such a way that both of the electrons of the bond are left in association with one of the formerly bonded atoms.

Examples of these processes include the reaction of a sodium atom with a chlorine atom to form a sodium cation and a chloride anion; the addition of a hydrogen cation to an ammonia molecule to form an ammonium cation; and the dissociation of a water molecule to form a hydrogen cation and a hydroxide anion.

Many crystalline substances are composed of ions held in regular geometric patterns by the attraction of the oppositely charged particles for each other.

Ions migrate under the influence of an electrical field and are the conductors of electric current in electrolytic cells.

Translation: Witnesses cannot testify to a negative; they must testify to an affirmative.