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Although their tones and timbres vary, sirens and alarms are universal harbingers of emergency. Mounted in homes and offices; on police cars, ambulances, and fire engines; and in airports, schools, and hospitals, they save precious lives every day with their cacophonous caterwauls that scream for all to hear: “Danger!”

If all goes to plan, scientists may someday begin building outposts on the moon — and some experts believe that these outposts could be constructed with bricks made out of lunar regolith. And now, a new study based on lunar regolith simulant experiments suggests that if these moon-dust bricks crack, bacteria could be used to seal them back up.

Liftoff of the five-satellite "Ice AIS Baby" mission occurred at 10:55 p.m. ET on Sunday night (Nov. 24).

These Lego Ideas SLS rocket, Kerbal Space Program and 'The Martian' concepts are incredible, and we hope they get made

Mountain Middle School eighth graders prepare their rockets for launch on Thursday. Students used bicycle pumps to created water pressure to shoot objects into the air. (Tyler Brown/Durango Herald)
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