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Museum of Science & Industry's Christmas Around the World TREE Exhibit !!
It is a conifer. The sticky sap is actually resin.
A christmas tree light checker works by checking the lights and bulbs in the line. It searches for a short or abnormality in current through out the wire, and reveals where it would be.
A note of caution- since it is 2 days after Christmas- and folks may be looking at disposing of a Christmas Tree. Burning branches from a Christmas Tree, with needles in place, will result in an incredibly HOT and FAST fire. You have a very high chance of starting a chimney fire, setting your home on fire, and being called very bad names by your Significant Other. While WOOD from a Fraser fir might be burned (not really great firewood, but can be burned) please do NOT try to dispose of your Christmas tree in the fireplace. Best wishes for a happy, SAFE New Year-
The examples of everyday series circuits are the flashlight that uses batteries to operate. Another example is the Christmas tree lights.