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What is a randomised controlled trial?

Randomised controlled trials are the most important way that new medical therapies (drugs, devices, procedures and so on) are tested. ‘Controlled’ means that volunteers in the trial are split into groups. On...
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Answered by Frederick H. • Biology tutor
4847 Views

What causes cancer?

There are lots of different types of cancer which affect different tissues in the body, and two cancers of the same type may not have the same causes. This makes cancer interesting, but also potentially conf...
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Answered by Frederick H. • Biology tutor
8769 Views

How does Fitzgerald present and develop the theme of The American Dream in The Great Gatsby?

This is a very common type of question both for 'The Great Gatsby' and also other classics (taking a very obvious theme and asking you to present some interesting thoughts on it). You're going to want to use...
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A positively charged particle enters a magnetic field oriented perpendicular to its direction of motion. Does the particle: A) Change its velocity, B) Change its speed, C) Accelerate in the direction of the magnetic field.

To answer this question you must use the magnetic field "Right Hand Rule". We know that if a charged particle enters a magnetic field it will experience a force ​perpendicular to both ​ the magneti...
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Answered by Sam H. • Physics tutor
16605 Views

What is the difference between a baked and a chilled margin?

Magma is intruded into country rocks at a high temperature, whilst the intruded rock is at low temperature. The temperature difference between the two leads to the edges of the intrusion to be rapidly cooled...
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Answered by Chelsea N. • Geology tutor
21539 Views