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15 facts about number 15
Education & Development

15 facts about number 15

...system. 7: A fifteenth wedding anniversary is called a crystal anniversary [A clear crystal] But is a crystal a rock? Crystals, rocks and minerals are three different materials. You can find out more in our Geology Toolkit, which includes a geology timeline, rock analyser, rock cycle, landscape features and safety tips. 8: Fifteen to One had a reputation for being one of...
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Article 10 mins
Centreless grinding
Science, Maths & Technology

Centreless grinding

...systems and applications Through feed​ [Images to demonstrate 'Centreless grinding' - see article ] Infeed End feed Manufacture: Centreless grinding is used primarily for volume production and finishing, particularly for work which cannot be held between centres. There are several types of centreless grinding, all of which consist of three basic elements: Grinding...
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Article 10 mins
Full mould casting (evaporative pattern)
Science, Maths & Technology

Full mould casting (evaporative pattern)

...system and the metal. Yields are slightly higher (50–80%) than the conventional methods, since risers are seldom needed. Typical products include automotive castings such as camshafts, crankshafts, ball-valve casings and caterpillar tracks. Materials: All castable materials with casting temperatures above that required to vaporise the polystyrene (≃700° C). The...
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Article 5 mins
Methods in Motion: Developing psychosocially informed self-help on gender
Health, Sports & Psychology

Methods in Motion: Developing psychosocially informed self-help on gender

...systems of privilege and oppression, and how these have shifted – or not – over their lifecourse. Regular lists of multiple experiences, where diverse individuals tell brief stories around an aspect of gender. These are anonymised accounts we heard in our therapy, activism, and research – from women, men, and non-binary, trans, and cisgender people. Autoethnographic...
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Article 10 mins
Sand casting
Science, Maths & Technology

Sand casting

...system moulded in the top and bottom halves of the mould. Cores are used to form holes in the castings. They are placed in the split moulds after pattern removal. Usually, cores are made by dry sand moulding techniques. Core sand is mixed with oil, organic bonding material and water. They are moulded in core boxes, then removed and baked at 170–230 ˚C. A newer method...
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Article 5 mins
Teaching reading: what are our long term goals?
Education & Development

Teaching reading: what are our long term goals?

...systems, these surveys arguably serve to constrain what counts as reading in school and are likely to limit longer-term goals. To foster readers for life, a better balance needs to be struck between teaching reading skills and encouraging reading for pleasure – volitional reading which reflects the agency of the reader. As Cremin et al., (2014) have shown readers...
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Article 10 mins
Growing plants, growing communities: Climate Camp, Veggie Gardens and Local Politics
Society, Politics & Law

Growing plants, growing communities: Climate Camp, Veggie Gardens and Local Politics

...system or 'AV'. But what happens when there is no vote – if an issue isn't addressed by the political parties of the day, or if the government retracts its election promises? Then there is protest, of course. Policed, of course, with 'legitimate force' used against any protesters deemed to be acting against the public interest (illegally). So a Climate Camp, a group of...
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Article 5 mins
Calculating your carbon footprint
Nature & Environment

Calculating your carbon footprint

...systems. Nevertheless, individuals can contribute by reducing their personal carbon footprints. The UK’s Committee on Climate Change said in its 2021 Report to Parliament that individual action could potentially reduce national emissions by over half by 2035. Meeting the Net Zero target will require increased action from people, as consumers, workers, households,...
View article Calculating your carbon footprint
Article 5 mins