A PERUSAL of the articles which have appeared in your journal on this subject (NATURE, vol. lxxxiii., pp. 48, 68, 188, 487, and vol. lxxxiv., p. 87) leads me to ask if the spectrum of water has ...

Single Metalens Focuses Entire Light Spectrum Into One Point for First Time—Tech Could Revolutionize Virtual Reality Published Jan 02, 2018 at 10:27 AM EST Updated Jan 02, 2018 at 12:47 PM EST ...

The colours of food are nature’s way of guiding us towards balance, health and vitality. Eating by colour offers a simple, accessible way to improve your diet and reduce the risk of chronic illness.

Black on the color spectrum. While there’s no black in a rainbow, photons anywhere in the electromagnetic spectrum can be seen as black. Or in some cases, they can’t be seen at all!