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Physics

HOW CAN A SLOPE MAKE WORK EASIER? »
A slope, or inclined plane, makes work easier because the force needed to move a load is ...
WHAT ARE SIMPLE MACHINES? »
Levers, wedges, slopes, screws, wheels, gears and pulleys are all known as simple machines. ...
IN SCIENTIFIC TERMS, WHAT IS WORK? »
To a scientist, work is done when a force causes something to move. The unit of measurement ...
ARE HUMAN BEINGS THE ONLY ANIMALS TO USE TOOLS? »
The simplest tools often act as extensions of parts of the body. For example, if your arms ...
HOW DO FIREFIGHTERS PROTECT THEMSELVES FROM HEAT? »
Firefighters need to wear clothing that is both fire retardant (slow to catch on fire) and ...

Chemistry

ARE HUMAN BEINGS THE ONLY ANIMALS TO USE TOOLS? »
The simplest tools often act as extensions of parts of the body. For example, if your arms ...
HOW DO FIREFIGHTERS PROTECT THEMSELVES FROM HEAT? »
Firefighters need to wear clothing that is both fire retardant (slow to catch on fire) and ...
HOW DOES A THERMOMETER WORK? »
As substances get hotter, their molecules move around more rapidly and they may take up ...
HOW IS HEAT ENERGY MEASURED? »
Heat energy, like other forms of energy, is measured in joules (J). Temperature is measured ...
HOW DOES A THERMOSTAT WORK?»
Most things get bigger when they heat up and smaller when they cool down (water is a ...

Biology

WHAT IS THE BLIND SPOT? »
The back of the eye is very sensitive, but at one point the optic nerve leads to the brain. ...
HOW DOES THE HUMAN EYE WORK? »
The human eye is a ball containing a kind of jelly that keeps it round, just as the air in ...
Is wildlife in danger?»
Many of us have a favourite wild animal, such as a tiger or bear. But did you know ...
How we can help the wildlife which is currently in danger?»
We must do more to protect nature. Experts say thousands of plants and animals may die out ...
Which unwanted visitors are endangering wildlife? »
When people bring new species into a habitat, they can threaten local plants and animals. ...