The American measurement system is quite messed up. Why do you use Fahrenheit when Celsius is better, easier to understand, and scientifically accurate? Then you have miles instead of kilometers, which makes it hard to break down into meters accurately. And pounds instead of kilograms? A thousand kilograms is a ton, which makes perfect sense. The imperial system is pretty insane

How can quantum measurement influence the past? In this exclusive studio interview, theoretical physicist Avshalom Elitzur uses the example of Schrödinger's cat to support his argument that quantum physics alters our conception of time and causation: a measurement done in the present influences not only the future, but the past. Tap here to watch the full interview.