Reader staffers share stories that fascinate, alarm, amuse, or inspire us.

Hey, did you read:

• The musings of John McPhee (you know who he is, right?) on frames of reference? (Among them: “Don’t assume that everyone on earth has seen every movie you have seen,” and “If you say someone looks like Tom Cruise . . . you are asking Tom Cruise to do your writing for you.”) Steve Bogira

• About the “gravitational lens” that according to a new paper in Science has allowed astronomers using the Hubble Space Telescope to watch the same supernova explode at different moments in time over the course of decades? (Another image in the formation, a so-called Einstein’s cross, is supposed to pop up again in a couple years.) Kate Schmidt

• Nikole Hannah-Jones on why blacks hesitate to call 911? (“You have grown up in a different country than I have.”) Steve Bogira

• About NASA’s mission to Ceres? Drew Hunt

• About using Tinder to find workers for odd jobs? Brianna Wellen

• About the oil train derailment yesterday near Galena, Illinois? —John Dunlevy

• That deporting undocumented immigrants is very expensive? Drew Hunt

• About music for cats? Aimee Levitt

• About the top MLB prospect who lives in a van down by the river—or, rather, in a Walmart parking lot? Gwynedd Stuart

• That the Bears traded Brandon Marshall to the Jets? Drew Hunt