Before Mount Everest was discovered, which was the highest mountain on earth?
You are given two water buckets and an endless supply of water. The one water bucket measures 4 liters exactly and the other ..
What do the letters on the board represent?
Jesse and Bob compete in a 100 metre sprint race. When Jesse gets over the finish line, Bob is at 90m. In a second 100m ..
This is one of my favourite puzzles. One seems to end up in a tangle quickly, going back and forth between generations. ..
In the book Red Rising: Book I of The Red Rising Trilogy, Darrow, a lowRed and true slave is presented with a challenge. ..
This is a very hard interview question, apparently asked during a number of Google and Amazon interviews. In my personal ..
There are answers for earth and non-earth people. No, I am not speaking about the Martians (although your aim for it has to be unearthly; ..
This riddle was published in the American Science column by Martin Gardner. Over the years, people have suggested different ..