Physical geography integrates and inter-relates landforms, water, soils, climate, and vegetation as the major natural elements of the environment. The focus of physical geography is on the zone of the ...

Methods A representative cross-sectional web-based survey was conducted in June 2009–January 2010 throughout the USA (N=1949). Using the short form of the International Physical Activity Questionnaire ...

Li and co-authors investigate the urban scaling laws of technology transfer in US cities, charting historical dynamics of the innovation landscape since 1858 and the emergence of new technologies ...