Things I still don't understand how they work

  1. Doppler Radar
  2. Percentiles
    Like, what does it mean to be in the 20th percentile? Is that good or bad?
  3. How a curveball works
  4. China's economy
    Like, who gets the money?
  5. Internal combustion engines.
  6. Money laundering
    I still don't get it. Another money thing. Like, what is a front? Do people actually buy things from them?
  7. How did glaciers make the mountains? Like, how did they really do that?