  QCD Laplace sum-rules are briefly reviewed and two sum-rule applications are
presented. For scalar gluonium, upper bounds on the lightest state are obtained
from ratios of Laplace sum-rules, and the role of instantons and the low-energy
theorem on these bounds is investigated. For the light-quark masses,
fundamental inequalities for Laplace sum-rules are developed, which lead to a
lower bound on the average of the up and down quark masses.
