These are simple devices, with an infra-red emitter and a photo-transistor, both facing upwards, but work at an unusual wavelength. “These contain both emitters and detectors for 940nm wavelength,” ...
It's always important to have good lighting, but some spaces require a little extra -- and that's why you should have an LED floodlight bulb. To name a few places that would benefit from one ...
Huh, I thought, cool, but I bet it’s gonna be so much better on a really good night. It wasn’t. If it seems to you that the northern lights have been in the news a lot lately, that’s because ...
Well, we have some good news Scientists say increased solar activity is behind the more frequent celestial shows. On Thursday evening, the aurora borealis, as it is official known, was again seen ...