This is a Berry interesting study.

But this caption:

Confocal microscopy images of worms of both sexes show high expression of an immune gene (green) upon exposure to a disease-causing bacterium in females (second from left) and males (far right). Other images show the absence of an immune response following exposure to the other bacterium in females (far left) and males (second from right). The males failed to learn from experience, even though their immune response to the harmful bacterium was identical to that of the females.

Didn’t make any sense at the beginning of the article. That last sentence isn’t connected to the picture at all. You only get that leap in logic much later in the text. It threw me off a lot.