There are plenty of awesome, new science books to keep geeks happy this Christmas. But one anonymous science-lover recently received the ultimate stocking stuffer—Laura Geggel at LiveScience reports that the most expensive printed science book was recently sold at Christie’s in New York. An anonymous buyer purchased a rare first edition of Sir Isaac Newton’s Philosophiæ Naturalis Principia Mathematica for $3.7 million.
According to Jasper Jackson at The Guardian, the auction house believed the book would sell for $1 to $1.5 million. The most recent sale surpasses an English-language edition of the Principia which was presented to King James II which sold in 2013 for $2.5 million.
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Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.