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Quiz
The Focus Quiz
Climate change has been in the news again recently with the publication of the IPCC's latest report, but how much do you know about global warming and the greenhouse effect?
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Q&A

Down on Earth, when we blow air into a mixture of soapy water, a bubble forms as the growing ‘bag’ of air formed from the soap film moves the surrounding air out of the way. In the...

Light is a form of electromagnetic (EM) radiation, and theory shows that the mass of photons f light is related to the range of this radiation. If, as most scientists believe, EM radiation has an...

Water is at its densest at a temperature of approximately 4°C. If you cool it further, it begins to expand again, and once it has completely solidified into ice, it has increased in volume by...

There are many types of ocean wave: presumably you mean those in deep water driven by wind on the sea surface. Although those waves move constantly forward, the water itself moves up, round, down...

Actually, desalination is used to provide drinking water. The largest desalinisation plant in the world is in the desert-bound realm of the United Arab Emirates. Closer to home, I’ve visited...

When studying the effectiveness of swimming pool filtration systems, researchers talk in terms of 'body fluid analogue' or BFA. This is a mixture of sweat and urine, plus skin and faeces that...

The Mississippi Canyon 252 oil well sits at the bottom of the Gulf of Mexico, 1522m below the surface of the ocean. The oil is gushing out of the damaged wellhead at an estimated rate of 2100...

At extremely low temperatures, silicon and germanium expand with cooling rather than heating. The effect is called negative thermal expansion. The same applies to carbon fibres and certain exotic...