sciencehabit writes: It's textbook physics: An electric charge near the surface of a material gets pulled toward the surface. However, if the charge is spread out into the right shape and moves fast enough, that attraction becomes a repulsion, one physicist calculates. The odd finding could help physicists avoid unexpected effects when guiding beams of particles such as electrons.
"What is wanted is not the will to believe, but the will to find out, which is
the exact opposite."
-- Bertrand Russell, _Sceptical_Essays_, 1928