Albert Einstein's Handwritten Mass Equation

The only known privately owned example of the equation E=mc2 written out by Albert Einstein has made its way to auction. Addressed to physicist Dr. Ludwik Silberstein, the handwritten letter is dated October 26, 1946, and reads, "Your question can be answered from the E = mc2 formula, without any erudition." It's written entirely in German and was kept in Silberstein's archives until recently when it was sold by RR Auctions. Predicted to bring around $400,000, the rare document far exceeded expectations when a bidding war raised the selling price to over $1.2 million.

Photos: RR Auctions

OOFOS OOcoozie Thermo Mule

Treat your tired feet to the ultimate aprés recovery this winter with the OOcoozie Thermo Mule from OOFOS. The patented impact-absorbing OOfoam™ footbed goes beyond comfort to reduce stress on the body. Paired with a quilted, Primaloft upper for insulated warmth this modern mule is deal for sliding on when lounging around the house, warming up after a cold-weather run, or just running errands.

Presented by OOFOS.

Aspinal of London Hunter Leather Flask

On the road or just a long country walk, Aspinal of London's Leather Hunter Flask is the perfect companion. Made from stainless steel, the flask is sized to slip into a pocket for a nip of your favorite drink wherever you go. Fine, full-grain leather binding holds two cups to share with a friend.

Presented by Aspinal of London.

Featured Gear

BOLDR Kelvin Heater

BOLDR has revolutionized home heating with Kelvin. The smart appliance uses sustainable infrared technology to keep you and your wallet comfortable. The option reduces consumption and is 30% more cost-effective than traditional convection methods. Owners stay in control with a wireless thermostat that connects to their phones. The accompanying app allows users to adjust the heat based on consumption and spending, schedule heating on a room-by-room basis, and see real-time monitoring of their bills. It's also compatible with Alexa and Google Assistant for voice control. With a sleek and modern design, the Kelvin integrates seamlessly into interiors and is easy to install, while its software continuously updates for maintenance-free use.

Presented by BOLDR.

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Featured Gear

Tinto Amorio Natural Wine Gift Set

Dedicated to creating sustainably produced natural wines using certified organic grapes from California, Tinto Amorio's wines are among the most sought-after in the category. This sampler includes three bottles of three different varieties — Jajaja Glou Glou Red Wine, Bheeyo Skin-Contact Orange Wine, and the best-selling Monje Orange Wine. Fermented wild with native yeasts and made in limited quantities, they're perfect for elevated holiday gatherings.

Presented by Tinto Amorio.

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Artifact