Wolfram Alpha. The ability to perform calculations on "nebulous" things is amazing. Things like comparing the population of China to the population the US (http

Wolfram Alpha. The ability to perform calculations on "nebulous" things is amazing. Things like comparing the population of China to the population the US (https://www.wolframalpha.com/input/?i=population+of+united+states+%2F+population+of+china https://www.wolframalpha.com/input/?i=population+of+united+s...) are great. Visual solutions to complex math problems? Awesome.