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4 ways to track 3I/ATLAS without a telescope as it makes its closest approach to Earth tonight

Interstellar comet 3I/ATLAS makes its closest approach to Earth on Dec. 19. Here's how you can track its progress both during ...
Scientific American

Two Möbius Strips Combine to Create a Bizarre Object That Only Exists in 4D

In geometry, there are surfaces that do without an inside or outside—and some need at least four dimensions to exist ...