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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This is one of a set of resources produced in conjunction with the engineering company Arconic. The resources are designed to support teaching of key engineering concepts at both key stage 3 and key stage 4, including the new GCSE in Engineering. This resource focusses on the application of maths in engineering....

Using a huge wall map of the world, flower pots, compost and videos, children find out everything there is to know about the fruit they eat. They investigate where their fruit has travelled from, and what transport was used getting it to the UK. Children explore the different parts of fruit and compare the seeds of...

This is one of a series of resources from the IET designed around the theme of the future of flight with the purpose of developing pupils knowledge and skills in science, design technology, engineering and mathematics. 

In this activity pupils calculate the amount of energy needed to launch a space...

This sub-collection includes shorter activities which can make effective starter and plenary activities, helping students to engage and further their understanding. The resources are:  

• Mr Zippy's Trainers: This brings together the ideas of friction, air resistance and materials using clear language...

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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