PINE Rebus

 P
INE

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

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Gets Rid of Bad Ones

Gets rid of bad ones,
Short and tall,
Tightens when used
One size fits all.

A noose.

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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

From Standard to Sequence

Starting with the word STANDARD, how can you take away two letters and add three digits to make a logical sequence?

Remove the two A’s, leaving: ST ND RD
Add 1, 2, 3 to produce: 1st, 2nd, 3rd.

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Two Hands But Can’t Clap

I have two hands but I cannot clap. What am I?

A clock.

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Round Like An Apple

Round like an apple, deep like a cup,
yet all the king’s horses cannot pull it up.

A well.

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Six Glasses In a Row

There are six glasses in a row. The first three are full of water, and the next three are empty. By moving only one glass how can you make them alternate between full and empty?

Pour the water from the 2nd glass into the 5th glass.

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Half of Eight

What is half of 8?

Hint: It’s not 4

3 (if you slice vertically) or 0 (if you slice horizontally)

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Two Faces But Show You One

I have two faces, but show you one.
I once had guests, but now have none.
I’m rarely bloody and seldom blue.
I’m often promised and sometimes new.

The moon. It has two sides, but on earth we only ever see one side. Man has been on the moon, but no one is there now. A full lunar eclipse is known as a blood moon, and the phrase “once in a blue moon” refers to something that rarely happens. Promising the moon is making an extravagant or impossible promise, and there’s a new moon once every lunar cycle.

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Apples Rebus

What does this represent?

APPLE
APPLE
APPLE
aPPLe
APPLE

One bad apple spoils the bunch.

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