William Lipscomb, who won the 1976 Nobel Prize in Chemistry, has died. He was 91. Lipscomb won the Nobel for his work using an X-ray diffraction approach to study the chemical bonding between boron and hydrogen, The New York Times reports. Lipscomb, the Times adds, was a protégé of two-time Nobel Prize winner Linus Pauling. Lipscomb is also remembered for his sense of humor as he took part in many Ig Nobel Prize ceremonies and even once noted in a paper that his group "made this observation with the benefit of hindsight. This science is known as retrospectroscopy."