2) Paleolithic period. The Columbia Encyclopedia, Sixth Edition. 2001
...Old Stone Age, the earliest period of human development and the longest phase of mankind's history. It is approximately coextensive with the Pleistocene geologic...

3) Great Britain. The Columbia Encyclopedia, Sixth Edition. 2001
...Great Britain, officially United Kingdom of Great Britain and Northern Ireland, constitutional monarchy (1996 est. pop. 57,412,000), 94,226 sq mi (244,044 sq km),...