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South Sudan, the world's youngest country, has experienced a rocky start to its life as an independent nation. Less than three years after gaining independence in 2011 following a violent liberation war, the country slid back into conflict. In the wake of infighting within the ruling Sudan People's Liberation Movement (SPLM), violence erupted in South Sudan's capital, Juba, in December 2013. The conflict pitted President Salva Kiir's predominantly Dinka presidential guard against Nuer fighters loyal to the former Vice President Riek Machar. As fighting spread across the country, it has taken...

Very Short Introductions: Brilliant, Sharp, Inspiring The immune system is central to human health. Growing understanding of the immune system, and especially the creation of immune memory (which results in long lasting protection), have led to major breakthroughs in medicine and the design of vaccines. In this Very Short Introduction, Paul Klenerman describes the immune system, and how it works in health and disease. He considers how the immune system evolved, the basic rules that govern its behaviour, and the major health threats where it is important. Paul Klenerman also explains how...