Ernst Ravenstein. Proposed many laws of migration, some of which are relevant todayDeveloped the gravity model (interaction between places based on population and distance)Studied internal migration in EnglandRavenstein was a geographer, cartographer, and demographer. Elsbeth Robson. Studies the impact of AIDS in highly affected Zimbabwe Found that health care reductions and AIDS shape children\'s life and their experiencesRobson found that many young children are taken out of school to serv9441
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