A stop sign causes traffic to stop. We can cross the street safely because of stop signs.
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In the Know
Patriots’ Day and the Boston Marathon
People in Massachusetts celebrate Patriots’ Day. Some dress up like … read more
In the Know
A Bumpy Ride
You are in rough patch of air. This is called … read more
In the Know
Just Found: An ‘Extinct’ Clam That is Alive
The clams were found in California. They were found on … read more