  The observable parameters of the electron indicate unambiguously that its
gravitational background should be the Kerr-Newman solution without horizons.
This background is not flat and has a non-trivial topology created by the Kerr
singular ring. This ring was identified with a closed gravitational string. We
discuss the relation of this string to the closed heterotic string of the low
energy string theory and show that traveling waves along the KN string give
rise to the Dirac theory of electron. Gravitational strings form a bridge
between gravity and quantum theory, indicating a new way to consistent Quantum
Gravity. We explain the pointlike experimental exhibition of the electron and
argue that the predicted closed string may be observed by the novel
experimental method of the "nonforward" Compton scattering.
