You know what they say...

It's so hot I can't think, but it's OK because I saved this. Oh, and did I mention it's hot? Also, near-death experiences: you and me at 1 pm ET. And 7 other things worth your time.

I’ve been holding onto this one for a slow, hot day. That day was yesterday (and the day before, and the day before that).

Bottom line upfront: Do your coworkers seem a little slow on the uptake? Is your boss a little sluggish? Are your employees having a hard time doing things they'd normally accomplish?

And if you’re not working—say, you’re retired, unemployed, funemployed, or independently wealthy—have you noticed recently that the average brainpower of the average folks you run into has, well, fallen a bit below average?

There could be a simple reason, according to Harvard scientists: It's that it’s so hot in America right now that people are becoming stupid.

This is not just a joke; temperatures have soared over the last 4 to 5 days in many parts of the US. It was 89 degrees Fahrenheit yesterday in NYC with insane-level humidity; plus 86 in Boston, 83 in Chicago.

And if it hasn’t been that hot where you are lately—well, just wait.

Back to Harvard—specifically, the T.H. Chan School of …