There are theories of weather, theories of the wearing off of group immunity, and even a theory of determination by economic circumstances. The most generally held current explanation is, however, that a pandemic like that of 1918 arises when a new and explosive strain of virus develops through...
Weather Clim. Extrem. 2014, 4, 11–18. [CrossRef] 2. Paneque, P. Drought Management Strategies in Spain. Water 2015, 7, 6689–6701. [CrossRef] 3. Tanaka, S.K.; Zhu, T.; Lund, J.R.; Howitt, R.E.; Jenkins, M.W.; Pulido, M.A.; Tauber, M.; Ritzema, R.S.; Ferreira...