Lili Anolik, Hilton Als, David Ulin, Evelyn McDonnell, Cory Leadbeater and Steffie Nelson share thoughts about author Joan Didion for what would have been her 91st birthday.

What birders well know, fans of “composite organisms” and other creatures can now learn: how to identify obscure species in the wild. By Robert Ito As told in Tarpley Hitt’s rollicking “Barbieland,” ...