Huh 
Airplane mode is no longer one giant off switch. Your phone has several radios, and modern software lets the short-range ones come back without waking the mobile network.
A rabbit’s hind-foot stamp is built to travel: it makes a sharp sound above ground and a vibration that can carry warning into the warren below.
The name is not poetic marketing: two glass reflectors really did resemble a cat staring back from the darkness—and the casing even behaved like an eyelid.
Behind a small wall hatch, a box on ropes carried hot dinners between basement kitchens and formal dining rooms—saving steps while keeping service out of sight.
Milk can look perfectly calm and then make a break for the hob in seconds. Its proteins turn ordinary steam bubbles into an expanding foam with nowhere to go.
Those swirling sparks appear without a single photon entering your eye. Pressure is making the visual system report activity in the only language it knows: light.
Your sunglasses and screen are both sorting light by direction. Rotate one filter against the other and they can accidentally build a very effective blackout.
A walking pigeon only looks as though it is nodding continuously. Its head actually pauses in space, giving its eyes a succession of steady snapshots.
Amsterdam’s famously wonky canal houses are not all leaning for the same reason. Some were designed that way; others are slowly losing an argument with the ground.
Before telephones and electric intercoms, a metal pipe could carry a surprisingly clear voice between floors—and sometimes summon help with a whistle.