Aaron Cohen, former head of Johnson Space Center, pioneer of shuttle program, dies in Texas

Former head of Johnson Space Center dies in Texas

Dermatologist Kligman, whose research led to acne and wrinkle drug Retin-A, dies in Pa. at 93

Retin-A researcher Kligman dies in Pa. at 93

Dermatologist Albert Kligman dies, research led to wrinkle drug Retin-A

Retin-A researcher Albert Kligman dies

PHILADELPHIA — Dermatologist Albert M. Kligman, whose research led to discoveries including the acne and wrinkle drug Retin-A but whose pioneering work was overshadowed by his experiments involving prisoners, has died. He was 93.

Fish and Wildlife director Sam Hamilton dies after suffering chest pains on ski slopes

Fish and Wildlife chief dies after skiing

WASHINGTON — The director of the Fish and Wildlife Service died Saturday after suffering chest pains while skiing in Colorado. Sam Hamilton was 54.

Bill Gordon, designer of famous Arecibo telescope in Puerto Rico, dies at 92 in New York

Designer of famous Arecibo telescope dies at 92

Bill Gordon, designer of famous Arecibo telescope in Puerto Rico, dies at 92

Designer of famous Arecibo telescope dies at 92

Andrew Lange, Caltech physicist who explored remnants of Big Bang, dead at 52

Caltech cosmologist Andrew Lange dead at 52

Andrew Lange, Caltech physicist who explored remnants of Big Bang, dead at 53

Caltech cosmologist Andrew Lange dead at 53

Former US Sen. Charles Mathias, moderate Md. Republican who championed civil rights, dies