One of the great debates in evolution is about how one species separates into two. The now classical allopatric speciation model has started to be questioned by recent findings that point to ...

A flow chart, or flow diagram, is a graphical representation of a process or system that details the sequencing of steps required to create output. A typical flow chart uses a set of basic symbols to ...

UNHCR has published a new dataset recording the number of people forced to flee during each of the years since 1962. This dataset presents the forced displacement flows. Stocks and flows Commonly ...