Yellow flowers dot the heuweltjies in the Namaqualand, South Africa [Courtesy of Alastair Potts] Until Clarke’s and Francis’ discovery, the oldest organic matter found in a termite colony came ...

Dermatologists often evaluate and treat conditions involving the mucous membranes. This epithelium is present not only in the eye, mouth, and genitalia but also in the nasopharynx. Although ...

Mucus in stool is normal, but it's not usually visible to the naked eye. When it is, you may notice stringy clear, white, or yellow goop in the toilet or clinging to your poop. It may be blood-tinged, ...