Can you solve this crossword where all hints are regular expressions?
How can an infinite number of mathematicians figure out their own hat colours?
Can you prove that there are arbitrarily many primes in arbitrarily big intervals?
Three mathematicians discuss a beautiful flower garden and the coloured flowers within.
Two realtors discuss who's netting the award for highest average commission, but it isn't clear who the winner is...
Please help me identify these 100 light bulbs by turning ON and OFF their switches.
Can you find the centre of the circle with just five lines?
How many matches does it take to find the winner of a tennis tournament?
Can you make the pyramid point the other way by moving only three coins?
Can you help these kids trick or treat their entire neighbourhood in this Halloween special?
How can two doctors operate two patients with only two pairs of latex gloves?!