John is the son of Jacob. So, Jacob is the_____of John's father?
How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?
How many times in a given day, minutes and hour clock comes in a straight line ?
Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?
A red house is made out of red bricks. A yellow house is made out of yellow bricks. And, a blue house is made out of blue bricks. So, what is a greenhouse made of?
Count The number of F's in the paragraph below: "FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS"
Who can jump higher than a Mountain?
What do you call a fish without an eye?
A large container is kept in open under the rain. Every passing hour, the water collected inside the container becomes double what it was. In ten hours, the container is filled completely. Can you calculate how long would it have taken to be filled in half?
2 ladies and 2 girls need to cross a river in a boat big enough for 1 LADY or 2 girls. How do they do it?
Twice ten are six of us, Six are but three of us, Nine are but four of us; What can we possibly be? Would you know more of us? Twelve are but six of us, Five are but four, do you see? What are we?
There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.
