From Geez, Jenny Henkelman on how stereotypes have followed us from our ancient caveside beginnings to our modern existence; Marianne Siemens on the stereotype of the childless woman; and not only do people interact with their own social identities, but we all make judgements about the identities of others. That giant tarantula is terrifying, but I'll touch it: Expressing your emotions can reduce fear. Self-defense for the self-driving car: As more autonomous robots go out into the field, their creators struggle with figuring out how to defend them from thieves and mischief-makers. Sham text: Johns Hopkins just acquired a massive collection of books and manuscripts — every last one of them fake. An interview with Craig Unger, author of Boss Rove: Inside Karl Rove’s Secret Kingdom of Power. A review of Dark Art: The Changing Face of Public Relations by Tim Burt. Changing attitudes about changing sex: Sex is changing, and so is transsexuality. From Diplomatic Courier, Whitney Grespon on when a passport teaches more than a diploma. A review of The Carolingian World by Marios Costambeys, Matthew Innes and Simon MacLean.