**Are
You Interested In The Number 7 ?**
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**7 is a
prime number.**

**1, 3, 4,
7, 11, 18, 29...**
**A Lucas
number.**

**= 2 - 1**
**A Mersenne
prime.**

**There are
seven days in a week.**

**Hept- or
Sept- means seven. A heptagon is a figure with seven sides and a heptachord
is a**
**seven-stringed
musical instrument. A septennium is a period of seven years and September
used to be**
**the seventh
month in the year, but not any longer.**

**The Seven
Deadly Sins are avarice, envy, gluttony, lust, pride, sloth and wrath (listed
in alphabetical**
**order,
not order of wickedness).**

**Among many
things that come in sevens are the Seven Wonders of the Ancient World,
the Seven**
**Sisters,
Shakespeare's Seven Ages of Man, the Seven Levels of Hell, and the Seven
Dwarves.**

**Netball
and water polo are both played with teams of seven players.**

**In Britain
the 20p and 50p coins both have seven sides.**

**Under British
law, when you reach the age of seven you can open and draw money from a
National**
**Savings
Bank account or a Trustee Savings Bank account.**

**7-Up is
a soft drink. It was invented in America in the 1920s by Mr C L Griggs
of Missouri who**
**originally
called it Bib-label Lithiate Lemon-Lime Soda. With a name like that sales
were poor even**
**though
the drink tasted good and so Mr Griggs set about changing the name. After
six attempts he**
**came up
with 7-Up, or so the story goes. 7-Up is also the name of a card game.**

**John Sturges's
1960 western The Magnificent Seven is about a Mexican village that hires
seven**
**gunmen
for protection from bandits. The story is based on an earlier Japanese
film made in 1954 -**
**Akira
Kurosawa's The Seven Samurai.**

**Roy Sullivan,
a park ranger from Virginia, USA is the only person to have been struck
by lightning**
**seven
times. Between 1942 and 1977 he was struck on top of his head (twice),
his eyebrows, his**
**shoulder,
his chest, his ankle and his big toe. Although he received hospital treatment
for his injuries, he**
**was extraordinarily
lucky to escape death from so many strikes.**

**Ask a number
of different people to give you any number between one and ten, and most
will choose**
**seven.
Ask people to name their favourite number between one and ten, and again
most will say**
**seven.**

**In 1956
George Miller wrote an article The Magical Number Seven Plus or Minus Two:
Some**
**Limits
on Our Capacity for Processing Information. This showed that the amount
of information**
**which
people can process and remember is often limited to about seven items.
One example of this is**
**called
the digit span.**

**Ask someone
to repeat back to you exactly what you say. Begin with four digits chosen
at random**
**e.g. 6
6 2 5. Then give them five digits e.g. 5 8 4 5 0, then six, and so on.
Carry on increasing the**
**number
of digits until they make a mistake. The longest number of digits they
get completely right is**
**called
their digit span and for most people this is about seven digits.**

**Suppose
someone is shown a pattern of dots for a very short time - just one fifth
of a second - and**
**they are
asked to count the number of dots they saw. If the number is less than
seven they will be**
**right
almost every time, but with more than seven, they will make lots of mistakes.**

**Seven is
not really a magic number, but does have an uncanny way of appearing in
all sorts of odd**
**situations.**

**A version
of this familiar problem appears on the Rhind papyrus written in Egypt
about 1650 BC -**

**
As I was going to St Ives,**
**
I met a man with seven wives,**
**
Each wife had seven sacks,**
**
Each sack had seven cats,**
**
Each cat had seven kits:**
**
Kits, cats, sacks and wives,**
**
How many were going to St Ives?**

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