Troglobites are small creatures that have adapted to life in a cave. To survive in the darkness, troglobites have evolved exceptional senses of smell, hearing and touch, but often lack sight and skin pigmentation.   Photo credit: Ryan Hagerty, USFWS

A measure of the ability of material to resist a force that tends to pull it apart. It is expressed as the minimum tensile stress (force per unit area) needed to split the material apart.

(Of electromagnetic radiation) having a wavelength just greater than that of the red end of the visible light spectrum. Infrared radiation has a wavelength from about 800 nm to 1 mm, and is emitted particularly by heated objects.

Ripples in space-time caused by massive objects moving with extreme accelerations. Learn more!