[frongpik]

It's a quote from wikipedia: an electron, moving in a magnetic field, experiences a force perpendicular to its trajectory, so the work - the dot product of the force and trajectory vectors - is zero.

I should probably add one unscientific remark (orthodox HN readers: proceed with caution). Per [...], the secret of organic lifeforms and the secret of intelligence are very different things. Organic lifeforms keep their shit together by balancing two kinds of magnetisms - od and ob - to direct the electricity - aour. Od is constructive, ob is destructive and aour performs all the action. That's somewhat similar to scientific notation: the H and B magnetic fields and the E electric field.