Stockholm - Two Dutch physicists won the 1999 Nobel Physics Prize yesterday for pioneering work which helped predict the behaviour of invisible particles which make up the universe. Martinus Veltman and his disciple Gerardus 't Hooft put new theories for the complex field of quantum physics - the study of minute units making up atoms - on a firm mathematical foundation, the Swedish Royal Academy of Sciences said.
An Egyptian scientist, Dr Ahmed Zewail, won the 1999 Nobel Chemistry Prize, for using a rapid laser technique to see how atoms in a molecule move during a chemical reaction, the academy said.