The answer to last week’s Mental Floss problem: Q: A perfectly preserved vehicle lies at the bottom of the sea. It is worth tens of millions of dollars. However, no one will attempt to salvage it. Why not?

A: Because it is the Lunar Rover at the bottom of the “Sea of Rains” on the moon.

Of course as soon as we fixate on the “sea” being a body of water the actual answer becomes very difficult to find. Our patterned thinking takes us to a place where it is no longer possible to conceive of a more lateral solution.

We have have more on how you solve this type of problem in next week’s Mental Floss …

This week’s mental floss challenge is:

A mountaineer climbs Mt Everest for the very first time. He hires a couple of sherpa guides and heads on up the mountain. Half way up, one of the guides falls into a deep crevasse, but they continue to climb without doing anything or raising an alarm. Why?

Good Luck!