For people like Deborah Otts, an online community can be lifesaving.

Readers react to the shootings at Bondi Beach in Sydney, Australia, and at Brown University. Also: Defining old; the East Wing teardown.

Readers react to developments in the U.S.-Venezuela confrontation. Also: A group of six women with decades of connection.

Readers respond to Michelle Cottle’s essay about her experience with her parents and the growing caregiver crisis.