This Catalyst article looks at the process of baking biscuits. All cooking involves chemical reactions but you are not normally aware of them happening. There is an obvious thermal decomposition reaction which takes place in the middle of this recipe – and you get fabulous ginger biscuits at the end.

Paint has been developed and used for thousands of years, allowing artists an increasing range of colours and textures. This article describes the different techniques of developing paint.

The article is from Catalyst: Secondary Science Review 2014, Volume 25, Issue 1.

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A Catalyst article about chemical reactions that occur in a blast furnace during the steelmaking process. This short article features a diagram of a blast furnace showing the active ingredients used to produce iron from ore.

This article is from Catalyst: GCSE Science Review 2006, Volume 16, Issue 3.

This Catalyst article explains how zeolites, sponge-like materials developed from naturally occurring minerals, are used as chemical sieves and as catalysts. Zeolites have incredibly widespread applications. They are used in consumer products such as washing powder and cat litter while many of the petrochemicals...

This edition of the Computing at School newsletter contains articles covering:

*CAS community resources

*BCS Certificate in Computer Science Teaching

*Master Teachers

*Pedagogy in computing teaching and across the curriculum

*The Barefoot Computing project

*Computational...

This Catalyst article looks at how an internal biological clock within every cell of the human body helps to co-ordinate and organise human behaviour and metabolism into approximately 24-hour rhythms – allowing organisms to synchronise with, and anticipate, day and night. When the body clock is disrupted in humans...

This Catalyst article looks at the discovery of the Arctica Islandica, a mollusc which carries a record of past environments in the banding of its shell. In 2006, scientists collecting material from the seabed off the north coast of Iceland found some clam shells which remarkably were found to have come from...

This toolkit from Plus magazine and Arctic Survey Education looks at models of climate change and sea ice growth.

The toolkit can be downloaded as a whole or as the individual components, which are:
• Arctic supermodels - background article
• Modelling ice thickness - worksheet and worksheet...

A Catalyst article about the sudden onset of an ice age and whether it is a scientific likelihood. Looking at evaporation, greenhouse gases and thermohaline circulation in the world's ocean currents the article explores likely scenarios for a major drop in temperature.

This article is from Catalyst: GCSE...

A Catalyst article about climate control, and specifically the process known as cloud seeding. Cloud seeding has met with initially encouraging results. The method entails adding silver iodide to the air in clouds to encourage ice crystals to form, so that they grow rapidly and produce more snow or rainfall than...

A Catalyst article examining what causes breaking waves to leave foam on the beaches. The article explores the human impact on the environment and the changes in the growth of algae in the seas.

This article is from Catalyst: GCSE Science Review 2005, Volume 16, Issue 1.

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This full program code demonstrates how arguments can be passed to Python programs at the command line. The program dynamically generates graphics, and the user can change parameters for the graphics using command line arguments. Suggestions for additional challenges are also included.

This briefing note, intended for Governors and Senior Management Teams, fleshes out the background to the introduction of computing in schools and is intended as a basis for a strategic debate about reform of the ICT curriculum. It has been written mainly with schools in mind, but the broad outline of the argument...