In this excerpt from How Sexual Desire Works, step inside the enigma of human desire, a psychological puzzle that stumped even Casanova.

Thank you to all of our readers who sent along their lunar photos as part of this summer's "Shoot the Moon" contest! Browse the beautiful submissions below, and don't miss our latest amateur astronomy title The New Moon.

Ayelet Haimson Lushkov, the author of Magistracy and the Historiography of the Roman Republic, offers an inventive look at the concept of leadership in the Roman Republic: through parallels with the 2014 English cricket team.

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