You might need a pen and paper to do this. Ian Stewart is a math genius. Earlier this week a math puzzle that had stumped mathematicians for decades was finally solved.
Test Several Mathematical Concepts at Once Here we must deal with imaginary numbers and fractions all at once.
All poor people have this. Below we have a collection of the worlds hardest riddles. The 10 Hardest Math Problems That Remain Unsolved. What has a tongue cannot walk but gets around a lot.