Dhananjay Gadre] happened across a useful little trick the other day. Take any old 1N4148 or 1N914 glass-package signal diode ...

Liquid metal controlled by low voltage reversibly switches color and infrared response in nanoscale surfaces, enabling low power reflective displays, sensors, and optical security features.

Reflectors mounted on the highway are a common sight no matter where you are, but you may not realize that each color, such ...

In certain parts of the USA, you might see bright, colorful stars adorning the homes of locals. What are they, though - and ...