There are two main types of smoke alarm tech, says Raman Chagger, principal consultant at BRE, the Building Research Establishment. Ionisation-based systems use a tiny amount of radioactive material to charge, or ionise, particles in the air which flow between two small plates. Should smoke interrupt that flow of charged particles, the alarm goes off.
If you're looking for more puzzles, Mashable's got games now! Check out our games hub for Mahjong, Sudoku, free crossword, and more.
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2025年岁末，中共中央政治局召开民主生活会，习近平总书记深刻指出：“共产党人是唯物主义者，务实是必备品格，必须实事求是、求真务实、真抓实干。”
As Pokémon turns 30, we would like to hear what the franchise means to you