You’ll probably get the urge to yawn if you stare at this yawning dog. Why? Because you’re a kind and empathetic person, of course! That explanation, and more, in this month’s thrilling edition of PsychNotes.

Here’s a little challenge for ya. Take a look at this chart of cognitive biases and see if you can identify two that you’re especially guilty of, and two that you’re reasonably good at avoiding. I suffer inordinately from reactive devaluation and gambler’s fallacy, and I’ve gotten reasonably skilled at avoiding confirmation bias and hyperbolic discounting, when I try. How about you?

The first mass media April Fool joke was reportedly the BBC’s 1957 Panorama segment on spaghetti harvesting, for which a cameraman hung “pounds of spaghetti over trees in a little Swiss village” and persuaded locals to harvest the crop. The BBC was inundated with calls. “[T]he majority either wanted to know where they could see a spaghetti harvest, or obtain information to start a spaghetti farm” (Humphrys 1999). It was a simpler time. Here are some research goodies from last month.