It can work out where pheromone molecules are coming from by comparing the signals from each antenna, in the same way that a person works out the direction of a sound by comparing signals from each ear.

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So the two lines on one chart are not a good way of comparing the total numbers affected, just the chances for one person.

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Drawing distinctions purely on the way that a book has been published now says more about the person making the comparison than the books they are comparing.

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Comparing the new year to a journey, he prayed that it "may lead on a path to peace for every person and every family, for each country and for the whole world".

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