Teachers can use these tools to promote discussions and help students move from concrete to abstract understanding of concepts.

Provided content. One ball on a Plinko board is unpredictable. Drop a thousand and they form a near-perfect bell curve—one of math’s most powerful ideas for 150+ years.

For the record, I was a big supporter of its formation; for way too long, owners — with two notably loud and grumpy exceptions — stayed on the sidelines, whining and muttering about City Hall, ...

People can sometimes come up with an idea that may seem absurd when you hear them bring it up. Yet, through some twist of ...