Tall in Morning, Short at Noon

Tall in the morning, short at noon, gone at night but I’ll be back soon. What am I?

A shadow.

Posted in Riddles

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

Bought By the Yard

I am bought by the yard but worn by the foot. What am I?

Carpet. Worn is used in the sense of a well-worn item.

(found on r/riddles)

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Thin Barn Word Ladder

Get from the word THIN to BARN by changing one letter at a time and forming another English word in each step.

1. THIN
2. _ _ _ _
3. _ _ _ _
4. _ _ _ _
5. _ _ _ _
6. BARN

1. THIN
2. CHIN
3. COIN
4. CORN
5. BORN
6. BARN

Posted in Brain Teasers

An Attorney for a Brother

The defendant testified, “The attorney is my brother,” but the attorney took the stand and denied having a brother under oath. Who is lying?

Neither one of them lied. The defendant was the attorney’s sister.

Posted in Brain Teasers

Greater Than God

It is greater than God and more evil than the devil. The poor have it, the rich need it and if you eat it you’ll die. What is it?

Nothing. Nothing is greater than God, nothing is more evil than the devil, the poor have nothing, the rich need nothing and if you eat nothing you’ll die.

Posted in Riddles

Starts and Ends with E

What starts with “e”, ends with “e” and has one letter in it?

Envelope. Eye is a potential alternative. When spoken out loud it sounds like a single letter (I).

Posted in Riddles

Next in the Sequence

Here is a series of numbers. What is the next number in the sequence?

1
11
21
1211
111221
312211

13112221

The next number in the series counts the previous numbers. Thus the first number is 1, which is one 1, or 11. To describe 11, you have two 1’s, or 21. Now you have one 2 and one 1, so the next number is 1211. The solution is to continue describing the previous number using only numbers.

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Tongue Can’t Taste, Throat Can’t Swallow

What has a tongue that can’t taste, a throat that can’t swallow, eyes that can’t see and a soul that will never die?

A shoe. It has a tongue, a throat, eyes (or eyelets) and a sole. I used soul here or else it would have given the answer away, but this riddle works best when told rather than read. And as the joke goes, old shoes never die, they just lose their sole.

Posted in Riddles

A Blood Red Shroud

The thunder comes before the lightning,
And the lightning comes before the cloud,
The rain dries all the land it touches,
Wrapping the earth in a blood red shroud.

What am I?

A volcano.

Posted in Riddles