  We study the gravitational description of extremal supersymmetric black
holes. We point out that the $AdS_2$ near horizon geometry can be used to
compute interesting observables, such as correlation functions of operators. In
this limit, the Hamiltonian is zero and correlation functions are time
independent. We discuss some possible implications for the gravity description
of black hole microstates. We also compare with numerical results in a
supersymmetric version of SYK. These results can also be interpreted as
providing a construction of wormholes joining two extremal black holes. This is
the short version of a longer and more technical companion paper
arXiv:2207.00408.
