It’s a principle that makes perfect sense — and for some, no sense at all. But like so many things in science and philosophy, the devil is in the details. The AP forces us to take a giant step ...

The principal told KTVU she wants her students to be “agents of change.” Guess what: They are. One last point. San Francisco is a city where dogs outnumber children.

It is what I call a principal principle, meaning it is a basic law that is foremost in importance. I borrow this from the Keystone species theory in biology, which I learned from watching PBS. It ...

DEAR WORD COURT: When I was in high school, some years ago, a teacher who was a grammar Nazi made a fuss about "principal" and "principle." She definitely impressed on me that there's a difference ...

On September 9, 2009 President Obama said “My guiding principle is, and always has been, that consumers do better when there is choice and competition. That’s how the market works. ….

Principal Lena Van Haren looks at Alexander Rowson as he and Jerome Palma debate how race impacts politics outside Everett Middle School in San Francisco, California, on Monday, Oct. 19, 2015.

DEAR WORD COURT: When I was in high school, a teacher who was a grammar Nazi made a fuss about "principal" and "principle." She definitely impressed on me that there's a difference between the two ...