THE length of the tropocollagen (TC) molecule is about 4.4 times that of the native collagen period (D) (refs. 1–4). The standard appearances of negatively and positively stained fibrils are ...

A South Carolina beach town once nicknamed “Dirty Myrtle” because of its rowdy nightclubs and strip joints has become a magnet for retirees in a nation that continues to age.

Edward S. Curtis (1868–1952) left an enduring mark on the history of photography in his 20-volume life's work, The North American Indian. Between 1900 and 1930, Curtis traveled across the continent ...