We found the BEST outdoor cold weather fun experiment was BUBBLES. When one blows a regular soap bubble at -30 F or -40 F, they freeze instantly and when they fall to the ground they simply roll around... FOR WEEKS! Sometimes they will crack, and look like a bunch of very large broken egg shells. We had a driveway full of roaming bubbles when we lived in North Pole Alaska. Great fun can be found everywhere!
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