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It seems people simply didn't care to add a visual to their phone calls -- in fact they preferred no visual at all. One of the things people like about a purely audio phone conversation is that you don't have to worry how you look. You can talk to someone before you've had your morning shower or even in your underwear. Nonetheless, by the 21st century, people started to embrace a similar technology -- webcams. Webcams enable users to engage in video conversations over a personal computer. With advanced technology and the popularity of the cell phone, the old underdog video telephony has emerged again. Is 3G technology lifting the videophone from the ashes? Read on to find out. For the hearing impaired, video conferencing for cell phones is much more than a "nice-to-have" feature. It allows them to communicate with friends and family in a way that, for a long time, has been relatively unavailable.|Driving on congested city streets might be a little easier if you had some help from a rearview camera system. See our collection of car safety pictures. Imagine you're driving through the tight streets of New York City during rush hour. As you brake for a stop light, a large cargo van pulls alongside of you in the left-hand lane, and suddenly you feel trapped. You creep forward to check if it's clear to turn right then slam the brakes as an aggressive SUV almost saws off the front end of your Honda Civic. Flustered, you make the turn then merge into traffic. Hoping to bypass the growing throng of irritated commuters frustrated with the slow commute, you take a left turn down a narrow street. The traffic is much better, and you quickly find out why as you approach the next cross street -- you're in a blind alley. With cars lining the curbs on both sides of the street you're attempting to turn onto, visibility is terrible and pulling out without causing an accident may be a challenge. The physics of brown dwarfs has continuously improved since the discovery of these astrophysical bodies. The first important developments were devoted to the description of their mechanical structure, with the derivation of an appropriate equation of state, and the modelling of their atmosphere characterised by strong molecular absorption. New challenges are arising with progress in observational techniques which provide data of unprecedented accuracy. The goal of this chapter is to describe some of the current challenges for the theory of brown dwarfs. Those challenges concerns atmospheric dust and cloud, non-equilibrium atmospheric chemistry, the effect of rotation and magnetic fields on internal structure and the very early phases of evolution characterised by accretion processes. The field remains lively as more and more high quality observational data become available and because of increasing discoveries of exoplanets. Indeed, many physical properties of giant exoplanets can be described by the same theory as brown dwarfs, as described in this chapter. contagio pelicula

















































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