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Most Popular Questions

Here are the most commonly asked and viewed 50 Questions on Tell Me How. Click on a link for the full answer:

How many moons does Saturn have?
Saturn has 46 known moons (as of 4th May 2005 when 12 more were discoevered). These moons vary...

How to find out what percentage one number is of another number?
You divide the number in question by 100 and then multiply it by the number you wish to find the...

What is a square number?
A square number is one of the most basic concepts of maths! It is simply the product of a number...

How many moons does Jupiter have?
This is difficult to call. The stable figure for several years was 16. However, recently another 23...

What are the names of Saturns moons?
Saturn has 30 moons, 12 of which are unnamed. The named ones are Pan, Atlas, Prometheus, Pandora,...

What are ciliated cells and what are their purpouse?
Cilia are tiny little hairs, hence ciliated cells are those with hairs on. These can beat in...

How was the earth made?
This is quite a wide question. However, the earth was thought to have formed thus: Billions of...

What is Jupiter made of?
The interior of Jupiter is hard to find out about due to the nature of the planet and it is hard to...

2 numbers are first added together and then multiplied together. The numbers added together = 18 and the numbers multiplied together = 45. What are the 2 numbers?
The numbers are 15 and 3.

How do clouds form?
Clouds are formed by the cooling of air containing water vapour, which condenses around tiny...

What is a brown ring test?
This is a test used in chemistry in order to test for the presence of nitrates.

How far from earth is the moon?
The Mean Distance of Moon from Earth is 238,712 miles (384,400 km). The greatest distance is...

What is a constructive wave?
A constructive wave, with regard the tide, is the name given to a wave that has a gentle and low...

Why do we need oxygen?
We need oxygen in order to breathe. Chemically, oxygen is used by the body in order to help us...

What is cobalt used for?
Cobalt is an element with many uses. One thing that is unusual about cobalt is that it is...

How can i get a biro stain out of a leather settee?
Really hot water - as hot as you can stand with leather cleaner and washing up liquid. SCRUB. Then...

What south american country has the largest land area?
Largest country in South America? That's an easy question! The answer is Brazil and by a very...

A flat shallow part of the Continent which is covered by Ocean is called?
These areas are known as continental shelves as the continent and its land gently shelves into and...

How are the Mississippi, Nile, and Amazon rivers alike?
I've been working on this problem also. The only thing's I could come up with were, they are the 3...

How deep is the deepest ocean?
The deepest part known is the Marianas Trench off the Phillippines. There the sea floor is an...

What is an adjective
This is a word that adds to a noun by describing it. e.g. a tall cat.

What are the names of Jupiter's moons?
Jupiter has many moons, some of which have only been discovered recently, and it is possible there...

What is the earth's crust made up of?
The earth's crust is made up of rock, a thin layer of rock in fact, that floats on the liquid...

How does gravity work?
Gravity is the force of attraction between objects. Every object with mass has a gravitational...

Who invented pi?
As a mathematical constant, no-one can be said to have invented pi. However the relationship can...

Hi how do i get felt tip pen out of my white leather sofa?
There are lots of methods described for removing felt tip pen ink from sofas in the cleaning...

What causes lightning?
Lightning is a discharge of electricity that occurs in a cloud, and makes it act like a battery...

Sponges are made of what kind substances?
Many people think that sponges are synthetic materials. However, believe it or not, a sponge is...

Where does a black hole lead to?
A very interesting question. The answer is that no-one is really sure what is at the end of a...

What is an alkali?
An alkali is a base that is soluble in water. Normally a base is a metal hydroxide but this does...

A bus travels at a speed of 80km/h. How far does it travel in 45 minutes?
V=d/t d=V*t V=80 km/h d=80*45*1/60 d=60 km

A car was sold for 2,975 after a 7% reduction in price. what is the original value?
This is a percentage change question - obviously I'm not going to give you the answer and do all...

What are competency based interview questions?
Competency based interviews are those that test you and your competencies! What this means is...

How can i remove curry stain from a cream leather sofa?
To remove a curry stain what you should do is use some washing up liquid with warm soapy...

How many moons does Neptune have?
Neptune is the planet with the fourth most moons in the solar system. The planet has a total of 13...

How did the fire of London start?
It was started by accident, in the house of King Charles II's baker at Pudding Lane, on Sept 2 1666

What are the three parts of an ATP molecule?
The three parts of an ATP molecule are as follows. The first part is adenine. The second part...

How can I get a flat stomach?
The best way would be to do standard sit-ups. There are many articles out there that have...

What colour is the moon?
The moon, we all may think, is composed of sterile white rock. However this image is actually...

A dice is thrown 80 times. it lands on a six 12 times. What is the probability of throwing a six?
The way probability works is: The number of possible outcomes __________________________ The...

Do ghosts exist, or can you give a scientific explanation?
Whether or not ghosts exist is a very personal belief, and hence the answers from one individual to...

What is a noun
A noun is a word that is used to refer to a person or a place or a thing, e.g. 'man', 'woman'

What is the world's smallest country?
This is the Vatican City, in Italy. It has a population of just 1,000 or so people!

How do i brighten & clean up my new CREAM leather sofa?
Get some warm water and pour a little vinegar into the mix - just a few drops. Use a clean cloth...

What can I use to clean a leather sofa?
Leather sofas - tricky one this - professional assistance is really what is called for here as many...

Do I exist?
According to Descartes, ' I think therefore I am'. Unfortunately for Descartes, the premise here...

When did life start on earth?
It has recently been suggested that life on earth began much earlier than once thought. The earth...

Am I in a computer simulation?
It is possible that you are in a computer simulation. In fact it is unlikely that you could ever...

What is the easiest way of working out percentages in your head?for example, how can you work out 25% of 328? i cant work out 0.25x328 mentally?
The easiest way is to work out what a simple percentage of it is, like ten percent or one percent,...

How do I remove a grease/oil stain from a leather settee?
The key is to use some sort of absorbant substance rather than something like water that would just...