If there are nine people in a room and every person shakes hands exactly once with each of the other people, how many handshakes will there be? How can you prove your answer is correct using a model ...

“I don’t think my child understands the importance of honesty,” a mother once said to me, after she found her child lying about eating Halloween candy that had been made off-limits. We teach children ...

It’s baffling, but our reality is that kids still learn the Pythagorean theorem but not how to balance a checkbook or what an annual percentage rate is. “A lot of times kids are money shamed—we teach ...