The new milk frother you are using to prepare your cappuccino is likely using magnetic gears. Magnetic gears transmit rotary motion like mechanical gears but instead of teeth they use magnetic attraction and repulsion between rotating magnets. Researchers have published a theory that extends the possibilities and applications for smooth magnetic couplings, which can produce an even motion without any counterforce. This research has several potential applications in nanotechnology, microfluidics and robotics.
from Geochemistry News -- ScienceDaily http://ift.tt/20Z8ZDD