High-Performance Window Trick

It'll take longer to read this than it will to check your windows

How to see if you are looking at a triple glazed window in three seconds:

Step 1: Pull a lighter out of your pocket.

Step 2: Light it next to the window.

Step 3: Count the reflections.

Boom.

The flame will reflect on each surface it sees—even if you can’t see them.

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