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"I do not fear computers. I fear the lack of them."

Physics

What will spacecraft be like in the future?»
Space shuttles will be replaced quite soon with space planes. America is developing a space ...
Who is building a new space station?»
America is leading a group of countries to build an international space station (ISS). The ...
What bounced around on Mars?»
The Mars Pathfinder probe dropped on to Mars inside a bundle of balloons. The balloons ...
Which voyagers visited all the planets?»
Humans can’t travel to other planets yet. A trip to Mars would need much bigger ...
Is there a telescope in space?»
Astronomers on Earth have their view spoilt by our cloudy, dirty atmosphere, which makes ...

Chemistry

What are acids and bases?»
ACIDS AND BASES Some substances and chemicals are very reactive. This means they ...
What are crystals and what are Solutions?»
CRYSTALS In many solid substances, the atoms or molecules are fixed in place but ...
What is oxygen and hydrogen?»
OXYGEN We cannot see, smell or taste oxygen. Yet it forms one-fifth of air and is ...
How would you help me to understand what molecule is?»
MOLECULES Atoms make up all the objects and substances in our world. But they ...
Why some metals are precious?»
PRECIOUS METALS Certain types of metals are precious or valuable. This may be ...

Biology

What is meant by rate of breathing?»
Fuelling the muscles With each breath we take, oxygen is delivered to the muscle ...
How breathing works?»
When the lungs take a breath in, they expand – but they can’t do this on their own. To ...
How does breathing affect speech?»
Humans need to breathe almost constantly, in order to provide all the body’s cells with ...
How does gas exchange take place in the lungs?»
Every second of every day a life-giving process called gas exchange occurs in the ...
What is responsible for swapping gases?»
Carbon dioxide leaves the blood and passes through the thin walls of the capillary and ...