But somewhere in humans' evolutionary history, that photoreceptor shifted more toward detecting violet than ultraviolet wavelengths. Perhaps we couldn't afford the damage to our eyes because we ...

A blood moon is set to grace the night sky this week, casting an eerie red glow over Earth. This rare total lunar eclipse ...

The signal is analysed by a latest-generation quad detector suited for violet wavelengths, providing the customer with five different analog optical signals. The complete board of signals includes ...