But a vortex mask requires only one telescope whereas an interferometer needs at least two, in order to combine, and thus cancel, several images.

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Lula owes his presidency not just to his traditional supporters, but to his success in persuading tens of millions of ordinary Brazilians that he would combine social justice with order and stability.

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But Markowitz's heirs have gone on to show that it is possible to combine securities in a portfolio in order to achieve a higher return as well as a lower risk.

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He could maybe therefore be given the option to choose his preferred network access method (WiFi, 3G, LTE, WiMAX, ..) or even combine some of the access methods in order to provide a bigger pipe.

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Instead, they simply combine the two variables according to a formula that the team was able to work out, in order to decide how much food to carry to the nest.

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