Consider the most advanced microclimate gadgets this year, ranked by effectiveness, utility and technical sophistication. Built for sizzling job sites, marathon commutes and sun-drenched outings with ...

The UV index measures the intensity of ultraviolet radiation from the sun on a scale of 0 to 11. The higher the number, the ...

The first circuits use transistors. Later versions move on to op amps and even have “storm intensity” meters. The final project uses an ion chamber from a smoke detector.