The study of physics-free motion.
Three rules to govern all of classical mechanics.
Change has a cost, and it is paid in energy.
How to keep things moving.
The grass is always bluer, if you run fast enough.
The science of staying still—from yoga to the justice of the sea.
An astounding fraction of modern physics stems from our understanding of springs.
The study of collective phenomena—more is different (but also the same).