While most voters know Kamala Harris is the vice president, polling suggests few know much more about her. The presidential candidate’s nomination speech gives her an opportunity to change that. Democrats worry that sexism will prevent Kamala Harris from beating Donald Trump. But research shows that Americans vote for women at the same rates they vote for men.  Critics review the latest film releases: “The Crow,” “Blink Twice,” “Between the Temples,” and “The Killer.” Tennis star Jannik Sinner tested positive earlier this year for a banned substance. Authorities said it wasn’t intentional, but it does cast a shadow over this year’s U.S. Open.