Hard puzzle about people walking in the street.
48816
Interesting Question on Ants
30625
Does the square or the circle have the greater perimeter? A surprisingly hard problem for high schoolers
32216
Clock hands moving to take each others places.
78163
Hint for problem on $4 \times 7$-chessboard problem related to pigeonhole principle
136449
Combinatorics problem on $20$ people, $12$ months, and distinguishable groups
44980
Prove that two paths on opposing corners of the unit square must cross.
30287
A word for the beginning of a street?
11656
2D random walk within a bounded area
58818
"There is a car on/in the street"
32181
A logic puzzle involving a balance.
146991
Puzzle question finding Calvin
71091
Word for people who live in the same city
60661
How to solve this combination problem quickly?
44943
The 3 different equals
141103
Up my street and down the lane
125716
What is another word for street-wise?
158281
100 blue-eyed islanders puzzle: 3 questions