By measuring the change in the dielectric constant of the surface of a sensor, thus detecting the presence of water or ice on the sensor's surface.

One of the first working examples of a synthetic nanosensor was built by researchers at the Georgia Institute of Technology in 1999.

Giving mice rapamycin, a drug that inhibits Tor, extends lifespan even if the mice are fairly old when the treatment begins.

Its sensor beams look both forward and backward at the same time, allowing it to do new exploration while it's still achieving geometric sensor lock on what it's gone through already.