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This method is by far the safest, yet it still allows divers to get up close and personal with the sharks. The cage, which is attached to a boat, is typically a rectangle and fits about four divers at a time. Once in the water, divers have a largely unobstructed view of the sharks as they swim within feet of the cage. What will you need if you want to cage dive with sharks? A healthy grip on your fear, for one. After that, you only need the basic equipment to snorkel or scuba dive, such as a wetsuit, a snorkel, a weight belt to keep you underwater, and scuba gear if you are a certified scuba diver. This method means that you don't need a tank in the water but can still be fully submerged to get the best view. The company that charters the trip should have most, if not all, of the equipment you will need. You'll learn more about the various companies and costs later.|As the threat of a Russian invasion of Ukraine continues to dominate the news, a look back at the long, intertwined history of the contentious neighbors reveals how the stage was set for today’s conflict. The two countries’ shared heritage goes back more than a thousand years to a time when Kyiv, now Ukraine’s capital, was at the center of the first Slavic state, Kyivan Rus, the birthplace of both Ukraine and Russia. In A.D. 988 Vladimir I, the pagan prince of Novgorod and grand prince of Kyiv, accepted the Orthodox Christian faith and was baptized in the Crimean city of Chersonesus. Yet over the past 10 centuries, Ukraine has repeatedly been carved up by competing powers. Mongol warriors from the east conquered Kyivan Rus in the 13th century. In the 16th century Polish. Lithuanian armies invaded from the west. In the 17th century, war between the Polish-Lithuanian Commonwealth and the Tsardom of Russia brought lands to the east of the Dnieper River under Russian imperial control. 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. la liga table

















































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