What to read around the web today

• Mattel, maker of Barbie, debuts gender-neutral dolls. The New York Times
• What makes dogs so special and successful? Love. The Washington Post
• We’ve been fighting the vaping crisis since 1937. FiveThirtyEight
• Why the myth of period syncing won’t go away. The Atlantic
• 23andMe, moving beyond consumer DNA tests, is building a clinical trial recruitment business. STAT