Here’s one:

1— The Bootstrap Paradox

Time traveling is a popular concept not only in science fiction like Interstellar but also in fantasies like Harry Potter. But, after reading this, you will realize that the time-traveling parts in those time travel movies are always a paradox.

Imagine you are a time traveler. You decide to meet the great greek philosopher, Pythagoras of Samos, and introduce him to the fantastic relation among the three sides of the right-angled triangle. You introduce and you leave.

Time goes by and he publishes it as ‘The Pythagorean theorem’ and you realize you were a part of the discovery of the legendary pythogorean theorem.

But this leads to an paradox. Who is the founder of the Pythagorean theorem in the first place? Because you helped him, but with a theorem by his past self. But his past self also has someone (your past self) helping!

Dinelka, “6 Scientific Paradoxes That Will Blow Your Mind” atMedium(December 28, 2021)

Don’t miss the other five.

*You may also wish to read:* Has a 243 year-old puzzle been solved via a “quantum solution”? At Quanta: In a paper posted online and submitted to Physical Review Letters, a group of quantum physicists in India and Poland demonstrates that it is possible to arrange 36 officers in a way that fulfills Euler’s criteria — so long as the officers can have a quantum mixture of ranks and regiments.