Har har har, physics textbook. You probably can’t read what the caption says so this is it When animals walk, the swinging movement of their legs can be approximated fairly well by treating their legs as physical pendulums. Such analysis has proved useful in analyzing the gaits of various creatures, from Beatles to elephants. and I’m pretty sure that’s the only joke they make in the entire textbook

Har har har, physics textbook.

You probably can’t read what the caption says so this is it

When animals walk, the swinging movement of their legs can be approximated fairly well by treating their legs as physical pendulums. Such analysis has proved useful in analyzing the gaits of various creatures, from Beatles to elephants.

and I’m pretty sure that’s the only joke they make in the entire textbook

beatles
textbook