Ruchira Paul at Accidental Blogger:
The scientists credited with the top seven eureka moments, in an ascending order of excitement (with the discovery of penicillin the winner) are:
- Otto Lowei: discovering the chemical transmission of nerve impulses
- René Descartes: developing the Cartesian co-ordinate system of perpendicular lines and planes
- Nikola Tesla: designing the alternate current motor
- Edwin Hubble: discovering the existence of galaxies outside the Milky Way
- Robert Hooke: discovery of the cell as the building block of all living organisms
- Henry Becquerel: discovery of radioactivity
- Alexander Fleming: discovery of penicillin
More here.