**Summary:**

In collaboration with Stefano Gandolfi (LANL), I combined neutron star mass and radius observations with recent results from quantum Monte Carlo on the equation of state of neutron matter to obtain: limits on the strength of three-neutron forces, the density dependence of the nuclear symmetry energy, and the size of the neutron skin thickness in lead. In particular the constraints on \(L\), a parameter which measures the density dependence of the symmetry energy are strong: we find \(L\) to be relatively small.

These results are published in
Phys.
Rev. Lett. **108** (2012) 081102 .

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