Word: nuclei
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According to the laws of electrodynamics, nature should be "symmetrical." There should be atoms with negative as well as positive nuclei. But for years after the discovery of atoms, all the evidence seemed stubbornly intent on proving that matter was unsymmetrical. The heavy, charged particles (protons) in the nuclei of atoms were always positive. The light particles (electrons) surrounding the nuclei were always negative. Never could the scientists find a "reversed atom" (negative protons, positive electrons) to back up the principle of symmetry...
Most of the pilots were scientists-chiefly meteorologists, electronics engineers, aerodynamicists-who devoted their spare time and their rainy hours to such pursuits as lectures by Geophysicist Joachim Kuettner on "A New Investigation of Stratospheric and Tropospheric Airflow in Powerful Mountain Waves," or "Research on the Transport of Freezing Nuclei and on Atmospheric Turbulence by Means of a Sailplane...
...Nebraska panhandle, he made a sideline of busting hailstorms. Whenever an unusually black and mean-looking thunderhead drifted toward the sugar-beet fields of the North Platte Valley, Cook would fly into it, seeding its turbulent heart with silver-iodide particles. This maneuver provided the cloud with plenty of nuclei for ice to form on, so the hailstones did not grow big enough to fall and cut up the tender beet leaves...
...this temperature, deuterium nuclei can react with one another at a rather slow rate. So when the Soviet scientists detected both free neutrons and high-energy X rays coming from the tube, they thought at first that they had started a true thermonuclear reaction. More careful investigation proved that this could not be the case, but free neutrons are the "fire" that cause most nuclear transformations, and any new process that frees them is apt to prove important...
...physics' most exciting recent discoveries is the antiproton. It resembles an ordinary proton (present in the nuclei of all atoms), except that its electric charge is negative instead of positive. There may be (but probably are not) places in the universe where antiprotons can exist permanently, but on earth they are short-lived. As soon as one of them touches the nucleus of an ordinary atom, it is annihilated. Both its own matter and the matter of a proton or neutron in the nucleus turn into a flash of energy...