Surface tension in the water can sling the craft out of control or cause it to bounce violently.

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Siphons, exploiting surface tension, remove a discrete amount of plasma to another chamber, where it is spun again and diluted.

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Jon Nelson, of Ritsumeikan University, in Japan, has calculated that the most important property involved is the surface tension of the tiny clusters of water molecules from which snowflakes form.

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The younger, impetuous Robin has a few things to learn from the calmer, more experienced Nightwing, though there is obviously some tension bubbling beneath the surface.

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The tension simmered just below the surface and sporadic scuffles broke out, with former England captains Martin Corry and Phil Vickery trading blows and ex-international team-mates Dallaglio and Julian White also squaring up.

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Pros have always varied their string tension a little based on the court surface, weather conditions and their opponent's style of play.

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