Radiation within the visible spectrum can appear black if it is low in power – more specifically, lower in power than its surroundings. Additionally, radiation outside the visible range of wavelengths ...
Citrus fruit rind color has long been used as an indicator of ripeness, but for some fruits such as mandarin fruit in the Chongqing region of China ...
Many of our favourite houseplants began life on the floors of forests or jungles, where light is dappled at best. Others, like cacti or plants with bright-coloured leaves like draecena or croton, came ...