Thanks to Alexander Wales joining Tumblr, I learned about qntm’s 13-year-old “hypertime” idea: the third model of time travel I’ve ever encountered that isn’t completely …

Do you disagree with a friend about how likely something is? This calculator will advise you on how to craft a “fair” bet, such that both of you expect to win the same amount (on average). …

A couple years ago, I learned about a novel way of handling the concept of “identity” and presenting it to your users, and the more I think about it, the more it seems like Obviously The …

• Take two moderately interesting functions that map the unit square to itself; for example, \[(x,y) \rightarrow \left(1-y^2, \sqrt{x}\right)\] and \[(x,y) \rightarrow \left(\frac{x+y}{2}, x\right)\]. …