The aim of this experiment is to investigate the velocity of charged ions in an electric field. This is of the same order as the drift velocity of electrons in a wire under the influence of the same field.  A variety of analysis and conclusions that can be draw are provided.

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An introductory lesson, linking ideas from flowcharts to the use of pseudocode. The presentation may need some editing to remove school specific information. It contains a link to the "Friendship Algorithm" sequence from Big Bang Theory and a link to the description section for Algorithms and Pseudocode from BBC...

The network flow problem involves finding the optimum route through a flow network; a directed graph where each arc has a capacity and each arc receives a flow. Typical examples include: evacuation plans and delivery services. The problem involves students analysing the plan of a school canteen and deciding whether...

This booklet, in the Unilever Advanced Series was first published in 1970. The booklet explains the phenomenon of fluorescence in terms of bonding and antibonding orbitals. It then shows how synthesis of organic molecules can be used to make fluorescers that can act as...

This Catalyst article looks at the use of fluoride in water supplies. The UK health secretary has announced that more water companies would be encouraged to add fluoride to the water supplies. The article looks at why fluoride is added, what the advantages and risks are and why should it be put into water.

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This poster describes four people in four different companies who all work together to produce an innovative flood defence system. To manufacture the produce requires the collaboration of designers, engineers, materials...

This Catalyst article explores how high-speed photography can reveal how mosquitoes can keep dry while flying in the rain.

To find out how mosquitoes survive impacts with raindrops, a group of engineers from Georgia Institute of Technology (USA) developed a system which allowed them to photograph collisions...

This Catalyst article looks at what it means to say that an astronaut is 'weightless'. The article looks at how astronauts are trained in aircraft and how underwater work can also help prepare them for space travel.

This article is from Catalyst: Secondary Science Review 2008, Volume 19, Issue 1.

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What do dental fillings, catalytic converters, mobile phones and jewellery have in common? They all make use of the metal palladium. This Catalyst article explains the properties of this metal, and how it can be used for a vast array of objects.

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This Nuffield Working with Science unit involves scientific investigations both in the laboratory and in the kitchen. The activities encourage students to apply the knowledge gained in new situations, to analyse data from tables and interpret experimental results....

A Catalyst article about careers in the food industry. The food and drink industries are part of a chain linking farming and growing through to food processing, manufacture and finally to the sale of food in supermarkets and restaurants. This article describes some of the many career areas in food technology...