1932, British physicist james chadwick conducted a series of experiments at Cambridge university. He bombarded the boron-10 nucleus with alpha particles, and obtained the nitrogen-13 nucleus and a new kind of ray, which proved that the gamma ray hypothesis was untenable. He proposed that this new radiation is a neutral particle with a mass similar to that of protons, and designed experiments to prove his theory. This neutral particle is called a neutron.
The+-sign in the figure represents the smallest inseparable unit of positive and negative electromagnetic information-quantum bit.
(john wheeler, a famous physicist, once famously said: Everything comes from bit by bit.
After the prosperity of quantum information research, this concept has been sublimated to everything from quantum bits.
Note: One point is one point.