From There to Here

I can travel from there to here by disappearing, and here to there by reappearing.

What am I?

The letter “t”.

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Archaeologist Laughed At

An archaeologist publicizes his find, a coin marked 649 BC, but is laughed at by his peers. Why?

No coins were ever marked BC because the BC / AD dating system wasn’t even devised until 525 AD. And it wasn’t widely used until after 800 AD.

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Name That Song

James makes a bet with Laura that he can use any name she can think of in a song she will recognize with the original lyrics. Laura takes him up on the bet and loses. What song did James sing to win?

Happy Birthday. When you sing Happy Birthday, you say the person’s name as part of the song.

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Surf, School, Room

What word can be added before or after these words to make a new word or phrase?

Surf, School, Room

Board. Surf board, school board (or maybe boarding school), board room.

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Silent Military Communication

How could a member of the military communicate silently and without light?

By using braille.

Braille was based on a tactile military code called night writing, developed by Charles Barbier in response to Napoleon’s demand for a means for soldiers to communicate silently at night and without light. In Barbier’s system, sets of 12 embossed dots encoded 36 different sounds. It proved to be too difficult for soldiers to recognize by touch and was rejected by the military.

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What Boys Use, Girls Like and Parents Hate

Boys use it, girls like it, parents hate it. What is this 5-letter word?

The phone.

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As I went over London Bridge

As I went over London Bridge
I met my sister Jenny
I broke her neck and drank her blood
And left her standing empty

A bottle of gin.

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Where do the Numbers Belong?

Three numbers, 16, 14 and 38, need to be assigned to one of the rows of numbers below. Where do the numbers belong?

A06893
B1527211019
C71471117

Hint: This is not a mathematical problem. The numerical values are irrelevant.

The rows indicate the shape of the number. Row A is rounded, B is mixed and C is linear. Thus, 16 belongs in row B, 14 in row C and 38 in row A.

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A Hidden Message

44 33 555 555 666 9 666 777 555 3

What is the message in this code?

Pressing these digits in sequence will produce HELLO WORLD on a cell phone (for an SMS text message).

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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.

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