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The motion of outer solar system objects hints at a hidden planet shaping their orbits. The upcoming Vera C. Rubin telescope in Chile could confirm its existence within a few years. Read our January issue to learn more: trib.al/hXvhRTl

The winter solstice is the culmination of a period every year when each cell in our body literally craves more light trib.al/GTze2jv
The proof that the Ap茅ry constant is irrational remains one of the most bizarre events in the history of mathematics trib.al/w1uYv5U
If there鈥檚 a hidden world in the solar system, a new telescope should find it trib.al/WYUqxJn
The healing potential of the brain鈥檚 most interconnected nerve intrigues researchers trib.al/Pvoo2cK
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Solve the grid in this medium Sudoku puzzle trib.al/xdiBUi4
A mathematician has calculated the ideal shape for a beer glass to keep the liquid inside as cool as possible trib.al/WZZjJD7
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Communities are thinking big and relying on smaller energy systems called microgrids to gain reliable energy autonomy trib.al/3DW41wX
For two decades now, the iconic twin Voyager spacecraft have been quietly overturning everything we thought we knew about the boundary between our solar system and interstellar space trib.al/d6WHfyV