1.97007 femtometer (quadrillionths of a meter): That's how unimaginably tiny the radius of the atomic nucleus of helium-3 is. This is the result of an experiment at PSI that has now been published ...

PROF. EVE'S interesting contribution to NATURE of June 30, p. 552, on the relation between the ionisation potential and the atomic radius induces me to publish certain similar ideas of mine on the ...