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

Les Mills The Works Home Gym

Train however you want, whenever you want with The Works home gym kit from Les Mills. The set includes the Smarbar barbell with 2.2, 5.5, and 11-pound weight plate sets, the Smartstep platform with four risers, a Smartband resistance band, mat, and 12 free months of Les Mills+ premium membership.

Presented by Les Mills.

KilgourMD Prevention Scalp Serum

The best way to stop hair loss is to catch ti before it starts. KilgourMD's Prevention Scalp Serum is the first line of defense, fortifying hair follicles and preventing them from shrinking to keep full-looking hair. Prevention Scalp Serum helps block the hormone DHT that triggers hair thinning while helping to protect against environmental and age-related damage.

Presented by KilgourMD.

Featured Gear

Nom Nom Dog Food

In a stroke of evolutionary brilliance, dogs have made themselves indispensable to humans as workers and companions. That kind of sticktoitiveness — and those adorable faces — deserve the best when it comes to chow time. Nom Nom's line of freshly-made dog food gives your four-legged family member a balanced, nutrient-dense meal. The high-quality, protein-packed recipes are so good they can double as treats or meal toppers for a fully satisfied pup. Enjoy 50% off your first box and free shipping.

Presented by Nom Nom.

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Featured Gear

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.

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