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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. People spend lifetimes trying to perfect their swings. Welcome to the gentleman's game of golf, where the breeze often carries a distant murmur of swear words, and expensive clubs suffer routine abuse. Since its inception sometime in the Middle Ages, golf has inspired obsession. Some players are lured by the refined aura of the sport, the sweeping links and velvety greens. Others are obsessed with golfing gear -- the latest drivers, spiked shoes and fancy putters. Still others simply enjoy driving around in the golf cart. There's no denying that golf sings a siren's song. Too often, however, that song is soured by a wicked slice or a ball that plummets to its final resting place at the bottom of a water trap. Ray Floyd. Any ham-fisted gorilla can grab a club. Start whacking away at the ball. However, if your goal is to improve your swing, the first step is to pay attention to the way you hold your club. noticias mundiales

















































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