Jan & Feb '26

Why is the sky blue ? It’s not as simple as Rayleigh scattering since Mars has a red daytime sky but blue sunsets, the inverse of Earth. Are two heads better than one? A neat probability puzzle: two friends each independently tell you the result of a coin flip, each lying 20% of the time. One friend gets you to 80% accuracy. How much does the second friend help? The answer is 0%. Video: Into the…