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...verb include: Act in such a way as to bring about the possibility of (an unpleasant or unwelcome event). Incur the chance of unfortunate consequences by engaging in (an action). Risk is something that is accepted as part of everyday life. The safety that people seek is constantly balanced against the benefits that they desire, which come with an associated risk. Perhaps a...

...LE = constant × M, where LE is the Eddington limit. Full calculations give This is the upper limit of the luminosity of a black hole of mass M - the luminosity can be lower than LE but not higher. The larger the mass M, the greater the value of LE. In fact, this is only a rough estimate. It assumes that the accreting material is ionized hydrogen (a good assumption) and...

...Les are having some friends round for dinner. There will be six of them sitting round their circular table, but unfortunately not all their friends get on well and so they want to arrange a seating plan that will keep everyone happy. Read the conversation between Sandy and Les and then work out how they can seat their guests. Sandy Faisal doesn’t get on with Gareth, so...