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### Re: Fun fact of the day (or whatever).

Posted: **Thu Aug 01, 2024 3:02 pm**

by **Mommy Christmas**

If you put a pound coin on the bottom left square of a chess board and then double the quantity on each remaining square of the board, the stack of coins on the last square will be3 light years high.

### Re: Fun fact of the day (or whatever).

Posted: **Thu Aug 01, 2024 3:10 pm**

by **rinks**

Mommy Christmas wrote:If you put a pound coin on the bottom left square of a chess board and then double the quantity on each remaining square of the board, the stack of coins on the last square will be3 light years high.

Just checked this. Got it to 1.36 light years.

EDIT:

Stupid Mac Numbers started on row 2, so it's 2.72. Close enough, I guess.

### Re: Fun fact of the day (or whatever).

Posted: **Thu Aug 01, 2024 3:11 pm**

by **Knoyleo**

rinks wrote:Mommy Christmas wrote:If you put a pound coin on the bottom left square of a chess board and then double the quantity on each remaining square of the board, the stack of coins on the last square will be3 light years high.

Just checked this. Got it to 1.36 light years.

Must have been one hell of a queue at the post office

### Re: Fun fact of the day (or whatever).

Posted: **Thu Aug 01, 2024 3:11 pm**

by **Imrahil**

But what is that in centimetres?

### Re: Fun fact of the day (or whatever).

Posted: **Thu Aug 01, 2024 3:12 pm**

by **rinks**

Imrahil wrote:But what is that in centimetres?

1291272085159660000.

### Re: Fun fact of the day (or whatever).

Posted: **Thu Aug 01, 2024 3:13 pm**

by **rinks**

Knoyleo wrote:rinks wrote:Mommy Christmas wrote:If you put a pound coin on the bottom left square of a chess board and then double the quantity on each remaining square of the board, the stack of coins on the last square will be3 light years high.

Just checked this. Got it to 1.36 light years.

Must have been one hell of a queue at the post office

Pension day, too.

### Re: Fun fact of the day (or whatever).

Posted: **Thu Aug 01, 2024 3:45 pm**

by **jawa_**

Mommy Christmas wrote:If you put a pound coin on the bottom left square of a chess board and then double the quantity on each remaining square of the board, the stack of coins on the last square will be3 light years high.

Nice one, Mommy!

This is a variation on the story of the origins of chess, in which a king offered the inventor of the game to decide upon a suitable reward:

Wikiversity wrote:Your Majesty I ask you for just one thing. Take your chessboard and place on the first square one grain of wheat. On the first day I will take this grain home to feed my family. On the second day place on the second square 2 grains for me to take home. On the third day cover the third square with four grains for me to take. Each day double the number of grains you give me until you have placed wheat on every square of the chessboard. Then my reward will be complete.

The King replied:

This sounds like a small price to pay for your invention of such a fascinating game, I will see that your request is granted immediately.

Source:

WikiversityBy square 64, the number of grains required for that square is

9,223,372,036,854,775,808 and the grains required to complete all 64 squares is

18,446,744,073,709,551,615 Source:

HeartoftheArt*Fun fact* .

### Re: Fun fact of the day (or whatever).

Posted: **Thu Aug 01, 2024 4:19 pm**

by **Victor Mildew**

Mommy Christmas wrote:If you put a pound coin on the bottom left square of a chess board and then double the quantity on each remaining square of the board, the stack of coins on the last square will be3 light years high.

KeanuWoah.gif

This is a great one.

### Re: Fun fact of the day (or whatever).

Posted: **Thu Aug 01, 2024 4:25 pm**

by **Moggy**

Mommy Christmas wrote:If you put a pound coin on the bottom left square of a chess board and then double the quantity on each remaining square of the board, the stack of coins on the last square will be3 light years high.

Sorry to ruin this with boring maths, but that's absolute bollocks because

no ladder is that long and you'd need one to get to the top of the pile.

### Re: Fun fact of the day (or whatever).

Posted: **Thu Aug 01, 2024 4:29 pm**

by **Tomous**

Moggy wrote:Mommy Christmas wrote:If you put a pound coin on the bottom left square of a chess board and then double the quantity on each remaining square of the board, the stack of coins on the last square will be3 light years high.

Sorry to ruin this with boring maths, but that's absolute bollocks because

no ladder is that long and you'd need one to get to the top of the pile.

Well you just put a single rung in the bottom left square of a chess board and then keep doubling it til you get a ladder big enough

### Re: Fun fact of the day (or whatever).

Posted: **Thu Aug 01, 2024 4:36 pm**

by **Moggy**

Tomous wrote:Moggy wrote:Mommy Christmas wrote:If you put a pound coin on the bottom left square of a chess board and then double the quantity on each remaining square of the board, the stack of coins on the last square will be3 light years high.

Sorry to ruin this with boring maths, but that's absolute bollocks because

no ladder is that long and you'd need one to get to the top of the pile.

Well you just put a single rung in the bottom left square of a chess board and then keep doubling it til you get a ladder big enough

I've checked, the longest ever ladder was 135 feet long. Which is a lot shorter than 3 light years.

### Re: Fun fact of the day (or whatever).

Posted: **Thu Aug 01, 2024 4:58 pm**

by **rinks**

Just build a Möbius ladder.

### Re: Fun fact of the day (or whatever).

Posted: **Thu Aug 01, 2024 5:01 pm**

by **Moggy**

rinks wrote:Just build a Möbius ladder.

### Re: Fun fact of the day (or whatever).

Posted: **Thu Aug 01, 2024 5:46 pm**

by **Victor Mildew**

### Re: Fun fact of the day (or whatever).

Posted: **Thu Aug 01, 2024 6:20 pm**

by **Curls**

Knoyleo wrote:rinks wrote:Mommy Christmas wrote:If you put a pound coin on the bottom left square of a chess board and then double the quantity on each remaining square of the board, the stack of coins on the last square will be3 light years high.

Just checked this. Got it to 1.36 light years.

Must have been one hell of a queue at the post office

I don't get this at all. Light years? Huh? Why is time suddenly involved?

The sum is 1 x2^63 which gives this (9.223372e+18) . How is this light years?

### Re: Fun fact of the day (or whatever).

Posted: **Thu Aug 01, 2024 6:28 pm**

by **rinks**

I think you get your forum membership revoked if you think a light year is a measurement of time.

### Re: Fun fact of the day (or whatever).

Posted: **Thu Aug 01, 2024 7:17 pm**

by **Moggy**

rinks wrote:I think you get your forum membership revoked if you think a light year is a measurement of time.

What about a parsec?

### Re: Fun fact of the day (or whatever).

Posted: **Thu Aug 01, 2024 7:22 pm**

by **rinks**

Moggy wrote:rinks wrote:I think you get your forum membership revoked if you think a light year is a measurement of time.

What about a parsec?

No thanks, I’ve just eaten.

### Re: Fun fact of the day (or whatever).

Posted: **Thu Aug 01, 2024 8:04 pm**

by **Curls**

A light year is the distance light can travel in a year....had to type that out to figure out what the hell you're all on about. I'd prefer you did your measurements in metres and Kilometres though.

### Re: Fun fact of the day (or whatever).

Posted: **Thu Aug 01, 2024 8:18 pm**

by **Moggy**

Curls wrote:A light year is the distance light can travel in a year....had to type that out to figure out what the hell you're all on about. I'd prefer you did your measurements in metres and Kilometres though.

Yes, it's much easier to say "9,460,730,472,580.8 km" than just saying "1 light year".