Reaction wheels are useful things, typically used by satellites to keep themselves oriented the right way up in space. Turning the reaction wheel creates an equal and opposite torque in the spacecraft ...

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A semi-colon can be used instead of a full stop between two related sentences. This links them together in a way a full stop doesn't. It looks like this ; When used correctly the semicolon can make ...

JANINE: Big crowd in tonight, Jeff. JEFF: Including Bob the superfan. Bob here has never actually seen Jess perform. JANINE: Let’s help him picture her in his head - we can use metaphors and similes.