the.com/stairs
gravity's stubborn enemy, climbed by everyone, conquered by no one without a little sweat
means A set of steps arranged to let you move between different levels of a building, one foot at a time.
from From Old English 'stǣger,' which traces back to the verb 'stīgan,' meaning 'to climb or ascend' — a root shared across the old Germanic tongues (German still has 'steigen,' to climb). So a 'stair' is quite literally a climbing-place, and the plural 'stairs' simply names the whole upward run of them. The same ancient climbing-root also gives us 'stile,' the step over a fence.
falling riskStairs send over a million people to ER yearly
penrose trickSome staircases loop forever, but only on paper
ancient designStone steps date back over 4,000 years
odd step ruleBuilders favor odd counts to ease your stride
fitness hackClimbing burns more calories per minute than jogging