Thousands of years ago, humans domesticated every possible large wild mammal species fulfilling all those criteria and worth domesticating, with the result that there have been no valuable additions of domestic animals in recent times, despite the efforts of modern science.

History as well as life itself is complicated -- neither life nor history is an enterprise for those who seek simplicity and consistency.

Thousands of years ago, humans domesticated every possible large wild mammal species fulfilling all those criteria and worth domesticating, with the result that there have been no valuable additions of domestic animals in recent times, despite the efforts of modern science.

All recognized famous inventors had capable predecessors and successors and made their improvements at a time when society was capable of using their product.

I'd rather spend my leisure time doing what some people call my work and I call my fun.

One person making a wrong decision affects the whole country.

The history of interactions among disparate peoples is what shaped the modern world through conquest, epidemics and genocide. Those collisions created reverberations that have still not died down after many centuries, and that are actively continuing in some of the world's most troubled areas.