When was the last time you tested the smoke alarms in your home? If you’re like many people, you may not even remember. Smoke alarms have become such a common feature of U.S. households that ...
Green Matters on MSN10h
What Happens If an Asteroid Comes Too Close to Earth? Don't Panic — NASA Already Has a Plan.NASA scientists are already finding ways to make sure that the end of the world will not be caused by an asteroid.
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