Lighthouse Lenses

Augustin-Jean Fresnel invented a lens that helped lighthouses prevent more shipwrecks. A  Vox video by Phil Edwards.

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Comments are welcome if they are on-topic, substantive, concise, and not boring or obscene. Comments may be edited for clarity and length.

Visiting Santa? Call for Directions.

If you plan on visiting Santa Claus in his polar workshop this season, better call that jolly old elf for directions. You may have trouble finding his place on your own:

“Adjust your compass now: the north pole is migrating to Russia,” Guy Adams, The Independent.

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Image by Mike Licht. Download a copy here. Creative Commons license; credit Mike Licht, NotionsCapital.com

Comments are welcome if they are on-topic, substantive, concise, and not boring or obscene. Comments may be edited for clarity and length. Yes, we know a GPS uses satellite navigation and not magnetism, but electronics are funnier.

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