c.400 BCE Greek philosopher Democritus envisages atoms as solid, indestructible building blocks of matter.
1805 John Dalton’s atomic theory of matter marries chemical processes to physical reality and allows him to calculate atomic weights.
1896 Nuclear radiation is discovered by Henri Becquerel, and is used to reveal the internal structure of the atom.
1938 Otto Hahn, Fritz Strassman, and Lise Meitner split the atomic nucleus.
2014 Firing increasingly energetic particles at the nucleus continues to reveal a slew of new subatomic particles and antiparticles.
The discovery at the turn of the 20th century that the basic ...