Always one for a decent "world's ____" tag line for their product releases, Samsung is naming their new SGH-X820 Ultra Slim Phone the "world's thinnest" at a mere 6.9mm (0.27-inches) thick, the same thickness as the iPod nano. Not content to be merely skinny, the candybar phone also features a 2 megapixel camera, MP3 playback, Bluetooth connectivity and TV out. There is a minor hump near the top of the phone off the back that might sully your results when using this thing to pick door locks, but otherwise it's hard to imagine how it can get much thinner than this and still have a claim to 3D space. The phone should be out in Europe and Russia this week, with China to follow in June, no word on price.
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The short answer is "no", but it is a qualified "no" because there are odd ways of interpreting the question which could justify the answer "yes". Light is composed of photons so we could ask if the photon has mass. The answer is then definitely "no": The photon is a massless particle. According to theory it has energy and momentum but no mass and this is confirmed by experiment to within strict limits. Even before it was known that light is composed of photons it was known that light carries momentum and will exert a pressure on a surface. This is not evidence that it has mass since momentum can exist without mass. [ For details see the Physics FAQ article What is the mass of the photon? ]. Sometimes people like to say that the photon does have mass because a photon has energy E = hf where h is Planck's constant and f is the frequency of the photon. Energy, they say, is equivalent to mass according to Einstein's famous formula E = m...
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