Semen is typically whitish-gray with a jelly-like texture, but it can fluctuate due to different factors. For example, certain infections may make your semen look more yellow or green. Your semen is ...

Abstract: Underwater images suffer from color distortion and low contrast, because light is attenuated while it propagates through water. Attenuation under water varies with wavelength, unlike ...

Eye color is determined by the amounts of melanin, pheomelanin, and eumelanin in the iris. Babies' eye color may change until about 1 year old, as most pigment is produced in the first six months.

Visit us in Washington, DC and Chantilly, VA to explore hundreds of the world’s most significant objects in aviation and space history. Free timed-entry passes are required for the Museum in DC.