  Heavy stable charged particles can exist, hidden from us in bound atomlike
states. Models with new stable charged leptons and quarks give rise to
realistic composite dark matter scenarios. Significant or even dominant
component of O-helium (atomlike system of He4 nucleus and heavy -2 charged
particle) is inevitable feature of such scenarios. Possible O-helium
explanation for the positron excess in the galactic bulge and for the
controversy between the positive results of DAMA and negative results of other
experiments is proposed.
