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Green, Blue, and Black
Ski Areas have a smart way to tell skiers the type of terrain they may be facing. Even the Ski Area map shows the runs by these three colors and symbols. Of course there is always the one “hot dog” ...
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Spring Cleaning
Image by anncapictures from Pixabay "I will restore your leaders ..."
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The Light that Saves
The Fresnel lens was pioneered by Augustin-Jean Fresnel in 1822. It was essentially a light magnifier. It uses the principle of bending light through a lens with “… concentric rings...
