Other prominent physicists include: Amedeo Avogadro (most noted for his contributions to molecular theory, in particular the Avogadro's law and the Avogadro constant), Evangelista Torricelli (inventor of barometer), Alessandro Volta (inventor of electric battery), Guglielmo Marconi (inventor of radio), Galileo Ferraris and Antonio Pacinotti, pioneers of the induction motor, Alessandro Cruto, pioneer of light bulb and Innocenzo Manzetti, eclectic pioneer of auto and robotics, Ettore Majorana (who discovered the Majorana fermions), Carlo Rubbia (1984 Nobel Prize in Physics for work leading to the discovery of the W and Z particles at CERN). Antonio Meucci is known for developing a voice-communication device which is often credited as the first telephone. Pier Giorgio Perotto in 1964 designed one of the first desktop programmable calculators, the Programma 101. In biology, Francesco Redi has been the first to challenge the theory of spontaneous generation by demonstrating that maggots come from eggs of flies and he described 180 parasites in details and Marcello Malpighi founded microscopic anatomy, Lazzaro Spallanzani conducted research in bodily functions, animal reproduction, and cellular theory, Camillo Golgi, whose many achievements include the discovery of the Golgi complex, paved the way to the acceptance of the Neuron doctrine, Rita Levi-Montalcini discovered the nerve growth factor (awarded 1986 Nobel Prize in Physiology or Medicine). In chemistry, Giulio Natta received the Nobel Prize in Chemistry in 1963 for his work on high polymers. Giuseppe Occhialini received the Wolf Prize in Physics for the discovery of the pion or pi-meson decay in 1947. Ennio de Giorgi, a Wolf Prize in Mathematics recipient in 1990, solved Bernstein's problem about minimal surfaces and the 19th Hilbert problem on the regularity of solutions of Elliptic partial differential equations.