Math education: here’s some good pieces on that topic. First up, Susan Fowler (now Rigetti) on how you can learn more math. One way to learn is to see how others do it. Here’s Fields medalist Tim Gowers working through math problems on YouTube. Also this is a good resource on YouTube: math channel.
Speaking of learning math, here’s a piece on how to fix math class.
Math theory: For fans of game theory: Game theory and Cuban Missile crisis. Here’s two more good theory pieces, one on Godel’s Incompleteness Theorems and one on Fermat’s last theorem.
Philosophy: Here’s two good pieces on math and philosophy: How Julia Robinson helped define the limits of mathematical knowledge and another on how math and philosophy need each other.
Physics and space: this is cool, Visualizing Black Holes with General Relativistic Ray Tracing. So is this: SpaceX’s Starship and NASA’s SLS Could Supercharge Space Science. This is odd, NASA Will Test Gigantic Centrifuge for Hurling Objects Into Space. This is fun, measuring the earth using the traceroute command! This is fascinating, what I learned as a hired consultant to autodidact physicists.
Brain: here’s two good pieces on the brain. First, Your brain expands and shrinks over time. Second, Deep sleep drives brain fluid oscillations.
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And by feed it I don’t mean drink more coffee. I mean eat foods that have been shown to help our brains work better. The author of 
Smart People I Know 