Every mathematician has a story that goes something like this. You’re at a party, and someone asks what you do for a living. “I’m a mathematician,” you say. “You must be a genius!” they reply. Or ...

(NEXSTAR) — Are you smarter than a Texas fifth-grader taking the STAAR Test? As another new school year begins, it’s never a bad idea to know what the kids are learning — or how hard the lessons are.

(NEXSTAR) — Are you smarter than a Texas fifth-grader taking the STAAR Test? As another new school year begins, it’s never a bad idea to know what the kids are learning — or how hard the lessons are.

Imagine a hypothetical baseball player. Call him Alex. He fails a drug test that is known to be 95 percent accurate. How likely is it that he is really guilty? If you said 95 percent, you’re wrong.