The wavelength is what determines light’s color, and these LEDs are amber (605-nanometer wavelength), light red (630 nm), deep red (680 nm), and near infrared (855 nm).

inTouch aims to strengthen seniors’ memories and boost their mental health by addressing what Le Moigne calls a "loneliness epidemic." A recent National Poll on Healthy Aging found that 75 percent of ...

Dick Tracy got an atom-powered two-way wrist radio in 1946. Marty Cooper never forgot it. The Chicago boy became a star ...