  We present molecular dynamics results for a two component, two-dimensional
Lennard-Jones supercooled liquid near the glass transition. We find that the
supercooled liquid is spatially heterogeneous and that there are long-lived
clusters whose size distribution satisfies a scaling relation up to a cutoff.
The similarity of several properties of the supercooled liquid to those of a
mean-field glass-forming fluid near the spinodal suggests that the glass
transition in the supercooled liquid is associated with an underlying
thermodynamic instability.
