Just came back from a pre­sen­ta­tion at the San Fran­cis­co Osh­er Life­long Learn­ing Insti­tute, where am teach­ing a class this fall. This OLLI is part of a net­work of more than 80 cen­ters sup­port­ed by the Osh­er Foun­da­tion. It is the third time I lead this class, and am look­ing for­ward to anoth­er fun expe­ri­ence.…