Today LED bulbs are very common all over the world, more than 50 % of the world's light sources are now LEDs. The main reason is that...

A decibel meter, or sound level meter, is an electronic gadget that measures the level of sound or noise. In a previous post, we looked...

The Geiger counter is a useful gadget that helps detect ionizing radiation. It was developed in 1908 by German physicist Hans Wilhelm...