Richard Wiseman's Blog, page 14

The Magical Match!

I have made a quick video of one of my favourite illusions.  Enjoy!

 

Answer to the Friday Puzzle…

On Friday I set this puzzle….

Imagine a test with 26 questions.  When you get a question wrong you are deducted 5 points.  When you get a question right you are given 8 points.  If you answered all of the questions, and had a final score of 0 points, how many questions did you answer correctly?

If you have not tried to solve it, have a go now.  For everyone else the answer is after the break.

You answered 10 correctly – but can anyone explain why?

I have produced an ebook containing 101 of the previous Friday Puzzles! It is called PUZZLED and is available for the Kindle (UK here and USA here) and on the iBookstore (UK here in the USA here). You can try 101 of the puzzles for free here.

It’s the Friday Puzzle!

Solution on Monday.

Imagine a test with 26 questions.  When you get a question wrong you are deducted 5 points.  When you get a question right you are given 8 points.  If you answered all of the questions, and had a final score of 0 points, how many questions did you answer correctly?

I have produced an ebook containing 101 of the previous Friday Puzzles! It is called PUZZLED and is available for the Kindle (UK here and USA here) and on the iBookstore (UK here in the USA here). You can try 101 of the puzzles for free here.

Answer to the Friday Puzzle….

First, if you are around Edinburgh, I am giving a talk tonight at the International Magic Festival on the psychology of magic and illusion.  Details here.

Second, on Friday I set this puzzle…

A long playing record has a 12 inch diameter.  The unused bit in the middle is about 4 inches in diameter, and there is a smooth outer edge one inch wide around the recording.  If there are 91 grooves to the inch, roughly how far does the needle move during the recording?

If you have not tried to solve it, have a go now.  For everyone else the answer is after the break.

About 3 inches – can anyone explain why?

I have produced an ebook containing 101 of the previous Friday Puzzles! It is called PUZZLED and is available for the Kindle (UK here and USA here) and on the iBookstore (UK here in the USA here). You can try 101 of the puzzles for free here.

It’s the Friday Puzzle….

Solution on Monday.

A long playing record has a 12 inch diameter.  The unused bit in the middle is about 4 inches in diameter, and there is a smooth outer edge one inch wide around the recording.  If there are 91 grooves to the inch, roughly how far does the needle move during the recording?

I have produced an ebook containing 101 of the previous Friday Puzzles! It is called PUZZLED and is available for the Kindle (UK here and USA here) and on the iBookstore (UK here in the USA here). You can try 101 of the puzzles for free here.

One comma would have made all the difference!

David B sent me this lovely autocue mess up…..

Answer to the Friday Puzzle….

On Friday I posted this puzzle.

A shop sells chocolates for £1 each, and you can exchange 3 wrappers for 1 chocolate. If you start off with £15, how many chocolates can you buy?

If you have not tried to solve it, have a go now.  For everyone else the answer is after the break.

You can buy 22 chocolates!  Did you solve it? Any other answers? I have a funny feeling this is going to cause some debate.

I have produced an ebook containing 101 of the previous Friday Puzzles! It is called PUZZLED and is available for the Kindle (UK here and USA here) and on the iBookstore (UK here in the USA here). You can try 101 of the puzzles for free here.

It’s the Friday Puzzle!

Solution on Monday.

A shop sells chocolates for £1 each, and you can exchange 3 wrappers for 1 chocolate. If you start off with £15, how many chocolates can you buy?

I have produced an ebook containing 101 of the previous Friday Puzzles! It is called PUZZLED and is available for the Kindle (UK here and USA here) and on the iBookstore (UK here in the USA here). You can try 101 of the puzzles for free here.

Best ever vine?

Again, loads of people sent me this and boy is it wonderful!

Amazing new optical illusion music video

Loads of people have sent me this great new video from OK GO. It must have taken a VERY long time to make and has some lovely stuff in it.  Enjoy.