In nuclear chemistry and nuclear physics, J-couplings (also called spin-spin coupling or indirect dipole–dipole coupling) are mediated through chemical bonds connecting two spins. It is an indirect interaction between two nuclear spins that arises from hyperfine interactions between the nuclei and local electrons. In NMR spectroscopy, J-coupling contains information about …

George Herbert Leigh Mallory (18 June 1886 – 8 or 9 June 1924): 546–547 was an English mountaineer who took part in the first three British expeditions to Mount Everest in the early 1920s.. Born in Cheshire, Mallory was introduced to rock climbing and mountaineering as a student at Winchester College.After graduating from Magdalene College, Cambridge, he taught …