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Physics

WHAT IS AN INDICATOR? »
An indicator is a substance that changes colour when it comes into contact with something ...
WHAT DOES A pH VALUE MEASURE? »
The abbreviation pH stands for “power of hydrogen”. It describes how concentrated the ...
ARE BASES AND ALKALIS THE SAME THING? »
A base is the opposite of an acid. Most soap and many household cleaners are bases. An ...
WHAT IS AN ACID? »
The word “acid” comes from a Latin word meaning sour. Acids contain hydrogen and, when ...
WHY IS ALUMINIUM KNOWN AS A POOR METAL? »
Poor metals have a low melting point and are quite soft, but they are still very useful. ...

Chemistry

WHAT IS AN INDICATOR? »
An indicator is a substance that changes colour when it comes into contact with something ...
WHAT DOES A pH VALUE MEASURE? »
The abbreviation pH stands for “power of hydrogen”. It describes how concentrated the ...
ARE BASES AND ALKALIS THE SAME THING? »
A base is the opposite of an acid. Most soap and many household cleaners are bases. An ...
WHAT IS AN ACID? »
The word “acid” comes from a Latin word meaning sour. Acids contain hydrogen and, when ...
WHY IS ALUMINIUM KNOWN AS A POOR METAL? »
Poor metals have a low melting point and are quite soft, but they are still very useful. ...

Biology

COULD HUMANS FIND HOMES ELSEWHERE IN THE UNIVERSE? »
As there are billions of planets in our universe, it is likely that some of them could ...
DOES THE PLANET HAVE ITS OWN RECYCLING SYSTEMS? »
The saying that there is nothing new under the Sun is strangely true. The stuff that makes ...
WHICH KINDS OF ENERGY WILL NOT RUN OUT? »
Wind, moving water and sunshine are always to be found somewhere on the Earth. All of these ...
WHAT ARE NON-RENEWABLE RESOURCES? »
Living things can grow and reproduce themselves. Given the right conditions, they can ...
HOW MUCH LONGER ARE PEOPLE LIVING NOW THAN IN THE PAST? »
In many parts of the world, life expectancy — the number of years that a person can expect ...