Green light produced the strongest effect even though water barely absorbs it, pointing away from simple heating and toward a force at the air-water boundary.
A soft magnetic guidewire bends toward an external field while its water-rich coating helps it slide through turns too tight for a hand to steer directly.
Two invisible chemical waves rise on different schedules, letting a leaf report whether it was heated, overlit, infected, or bitten before damage dominates the view.
The same polymer feedstock can cool into a stiff utensil or a soft pressure-sensitive adhesive, depending on how many reversible bonds are allowed to reform.