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...techniques for looking in detail at samples of sand. The album draws on material originally created to support The Open University course Exploring Science... Exploring sedimentary processes A brief introduction to this album. From granite to sand How sand is formed by the weathering of moorland rock. Sand under the microscope What microscopic investigations reveal about...

...dealt with the unprecedented technological challenges by using techniques such as call gapping to help free up other services... The AT and T Network How AT and T handled the unprecedented rise in phone calls. Call Gapping A way in the network distributed calls to avoid an overload. Statistical Spikes AT and T completed a record 430 million call completions on 9/11....

...technique. The casting slip is a suspension of fine particles (<5 µm) in a liquid medium such as water or alcohol. Additives such as deflocculating agents prevent aggregation of particles. The pH is controlled to achieve a minimum viscosity of the slip by additions of NH4OH, HCl or H2SO4. The slip is poured into a permeable mould at a controlled casting rate such that...

...techniques, including measuring the ‘wobble’ of the parent star as it is tugged to and fro by the orbiting planet, and measuring the ‘wink’ in the star’s light output as the planet passes in front of it. It’s now clear that planets around other stars are ubiquitous – stars are orbited by planets as a rule, rather than the exception. However, these...

...techniques enabling us to observe how activity within the brain changes as different tasks and actions are completed. Read an overview of how these techniques in this brief guide to neuroimaging. And this article on one of the most commonly used techniques, functional magnetic resonance imaging, is also interesting. The brain and your health Many different health...