This Design Idea gives two versions of an indicator light that changes from green to red as a battery discharges. There are many circuits that do this sort of thing, but all the ones I have seen are ...

All of a sudden I'm having trouble saving good looking jpegs of my photos out from Photoshop (CS5). In CS5 and Lightroom they look good, with smooth colour transitions. If I take a screenshot of a 100 ...

I understand how transition metal ions can absorb light of specific wavelengths, and the remaining non-absorbed light will have a colour. I get d-orbital splitting and how the energy difference ...