Flora Not Fauna

I am flora, not fauna,
I am foliage, not trees,
I am shrubbery, not grass,

What am I?

A bush.

Posted in Riddles

Captain Mark

Captain Mark is the captain of the ship. The captain of the ship is Captain Mark. The ship has plenty of space.

What is the name of the ship?

The Space Shuttle Endeavour, captained by Mark Kelly.

I received this by email from someone who didn’t know the answer. Thanks to Devon for helping with this answer.

Posted in Riddles

Subtract One and Twelve Remains

A word I know, six letters it contains, subtract just one and twelve remains.

Dozens, dozen.

Posted in Riddles

A Perfect Counterfeit

A man can make perfect counterfeit bills. They look exactly like real ones, they’re made of exactly the same materials, made the same way, everything. So perfect, one could pretty much call them real bills. One day he successfully makes a perfect copy of another bill. However, he gets caught when he tries to use the copy. How is this possible?

As a counterfeiter, he had lots of counterfeit bills around and he accidentally used one of them as his original. So he made a perfect copy of a counterfeit bill.

Posted in Brain Teasers

A Slight Inclination of the Cranium

A slight inclination of the cranium is as adequate as a spasmodic movement of one optic to an equine quadruped utterly devoid of any visionary capacity.

Translate this rather strange sentence into one that is more sensible.

A nod is as good as a wink to a blind horse.

Posted in Brain Teasers

PINE Rebus

 P
INE

Pine cone (pine in the shape of a cone).

Posted in Riddles
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A U2 Concert

U2 has a concert that starts in 17 minutes and they must all cross a bridge to get there. All four men begin on the same side of the bridge. You must help them across to the other side. It is night. There is one flashlight. A maximum of two people can cross at one time. Any party who crosses, either 1 or 2 people, must have the flashlight with them.

The flashlight must be walked back and forth. It cannot be thrown and other tricks like that are not needed to solve the problem. The solution is simply a matter of allocating resources in a certain order. Each band member walks at a different speed. A pair must walk together at the rate of the slower man’s pace:

Bono: 1 minute to cross
Edge: 2 minutes to cross
Adam: 5 minutes to cross
Larry: 10 minutes to cross

For example: if Bono and Larry walk across first, 10 minutes have elapsed when they get to the other side of the bridge. If Larry then returns with the flashlight, a total of 20 minutes have passed and you have failed the mission.

This is one of my favorite brain teasers and I want to give you the satisfaction of figuring it out on your own. If you’re having a hard time, here’s a hint: There is a valid answer that doesn’t require tricks like throwing the flashlight or shining it backwards or having some other means of moving the flashlight.

There’s an assumption people often make that keeps them from solving this. Two members cross the bridge each time, but neither one of the two who crossed necessarily need to return. Think about how that would be possible. If you’re still stuck, use objects to simulate their movements. Use whatever you have laying around – pens, paper, erasers – and move them back and forth. Good luck!

Posted in Brain Teasers

A Family of Seven

I’m a family of seven,
Two are bitter and harsh,
Four are twins,
The last is the warmest of all.

What family am I?

The Seven Seas. The first two are bitter and harsh, the north and south ones are the twins, and the Indian Ocean is the warmest of the bunch.

  1. Arctic Ocean
  2. Antarctic Ocean
  3. North Atlantic Ocean
  4. South Atlantic Ocean
  5. North Pacific Ocean
  6. South Pacific Ocean
  7. Indian Ocean
Posted in Riddles
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Marcus’ Strange Age

Marcus was 15 years old in 2010. In 2015 he was only 10 years old. How is this possible?

The years are B.C., so 2015 came before 2010.

Posted in Brain Teasers

False Positive HIV Test

Imagine an HIV test that is 95% accurate (false positive rate of 5%) and around 2% of the tested population is infected with HIV. What is the probability that you actually have HIV when your test comes back positive?

29%

To read more about this, see the False Positive Paradox page on Wikipedia.

Posted in Brain Teasers