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Computational models based on discrete dynamical equations are a successful way of approaching the problem of predicting or forecasting the future evolution of dynamical systems. For linear and mildly nonlinear models, the solutions of the numerical algorithms in which they are based, converge to the analytic solutions of the underlying differential(More)
The biology of snow voles seems to contradict scientists’ assumption that natural selection favours big animal bodies over small ones. A study of the voles suggests that selection has favoured genetic changes that promote smaller body size. Larger snow voles (Chionomys nivalis; pictured) produce more offspring than smaller ones. To work out why this hasn’t(More)