Men are definitely sweatier than women. Previously this was put down to the larger male stature, but a team of scientists at University of Dortmund, Germany, led by Barbara Griefahn, say different. In their laboratory they have set up a mock 'sweltering car'. 'Volunteers' sit for up to 2 hours under heat lamps, mimicking the effect of the sun beating down through the windscreen. Under these conditions men lose about 250 mls of sweat per hour during the experiment, 70 mls an hour more than female volunteers. This makes them officially sweatier, even allowing for size and weight, say the scientists.

No, not at the moment, but thanks to a new invention from a Tokyo company called Temco, that could soon change. The dog receives instructions from its handler transmitted by radio link to a loudspeaker harnessed to the back of its head. The soundwaves from the speaker are transmitted through the skull bones to the ear drums so it can still hear its handler's voice as though they are only a short distance away.
'Bone Phone' - new mobile uses bone conduction to let you chat 'hands free'

Yes, there is a scientific reason why wearing some colours will affect the apparent size of your bum. The reason that we look larger in pale colours, and thinner in dark (especially black) ones, is because our perception of the shape of the surface depends upon minute shadows and patterns on the surface. Compare how easy it is to spot a wrinkle in a light coloured shirt compared with a dark one. So if you wear dark trousers you cannot see any shadows, because the background is dark, making it more difficult to perceive the actual shape of the bump underneath. Patterns also play a role. If you wear something with vertical lines that start off parallel, then move apart, then back together again, to form a fish-eye shape, looking at the pattern gives the impression that there is a bump underneath, even though there isn't.