Their SpaceX capsule made a fast and fiery re-entry through the Earth's atmosphere, before four parachutes opened to take them to a gentle splashdown off the coast of Florida.
OpenAI is negotiating with the U.S. government, Sam Altman tells staff
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Optical-based smoke alarms use light instead. They are slightly better at detecting the large smoke particles created by slow, smouldering fires. When such particles enter a chamber in the device, they scatter light from a small light source, which is then picked up by a photoelectric sensor.
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