A French revolutionary clock.

• Two newly discovered letters by Jane Austen’s brother, Charles, “shed a suggestive and unexpectedly saucy light on the ways her literary reputation was kept alive in the decades after her death in 1817.” (That sauciness is literal and figurative, I’ll have you know.)
• The politics of the calendar: Why have so many nations attempted to change the way we mark time? “In perhaps the most famous example, the French Republican Calendar not only reorganized the days and months around a ten-day week called a décade, but also restarted the entire thing at Year I. At the time John Quincy Adams decried it as ‘superficially frivolous’ and ‘coarsely vulgar,’ not to mention ‘irreligious’—but this was of course the point: the de-Christianization of the calendar.”
• On the photographer Duane Michals, a retrospective of whose work is currently at the Carnegie Museum of Art: “In a career spanning more than half a century he has worked in both utilitarian black-and-white and luxuriant color, produced slapstick self-portraits, evoked erotic daydreams, pamphleteered against art world fashions, and painted whimsical abstract designs on vintage photographs.”
• The war on sadness in language: “A new study published in the Proceedings of the National Academy of Sciencesexamined 100,000 words across texts in ten different languages and found ‘a universal positivity bias.’ ” We demand more sad words.
• Dominique Strauss-Kahn’s orgies happen four times a year. What else happens four times a year? We can think of a thing or two …