Element 113 (ununtrium) and 115 (ununpentium)
2004 — The Degree Angular Scale Interferometer (DASI) first obtained the E-mode polarization spectrum of the cosmic microwave background radiation.
2004 discovery of Pallene
2004 discovery of Polydeuces
14 November 2004 Death of David Stanley Evans in Austin, Texas, USA
2004 Death of Mervyn Hine
Physiology or Medicine to Richard Axel and Linda B. Buck "for their discoveries of odorant receptors and the organization of the olfactory system"