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Hippos are well-loved, cumbersome, rotund mammals famous for lounging around semi-submerged in muddy pools. Gregarious herbivores, they emerge after dusk from the water into the cool night air to graze on grass and plants before returning to the water at sunrise. They have huge mouths adapted for grazing as well as large, sharp tusks and jaws powerful enough to bite through crocodiles, small boats and even humans.The common hippo, once found all over Africa, is now largely confined to South and East Africa, while its close relative, the mysterious pygmy hippo, is only found in the forests of Sierra Leone, West Africa. Hippos originated in Asia and share a common ancestry with whales. Until the last Ice Age, they were found across Europe, including Britain. The ancient civilizations of North Africa and the Middle East were familiar with the common hippo, as it was still plentiful along the Nile. To the Egyptians it was a revered deity while at the same time it was hunted for sport. While the Romans imported them into their circus spectacles in Rome, today the best place to see the common hippo is in its natural African environment.
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Our knowledge of breathing has shaped our social history, and philosophical beliefs since prehistory. Breathing occupied a spiritual status to the Ancients, while today it is central to the practice of many forms of meditation, like Yoga. Over time physicians ,scientists and engineers have pieced together the intricate biological mechanisms of breathing to devise ever more sophisticated devices to support and maintain breathing indefinitely, from Iron lungs to the modern ventilator. Breathing extra oxygen has allowed us to conquer Everest, travel to the Moon, and dive to greatest ocean depths. We all seek fresh air and expect clean air to breathe, but with air pollution increasing this expectation is no longer being met. Today, airborne ailments like COVID-19 are causing disasters on a global scale. This is the story of breathing; a tale relevant to everyone.