Cytologists had been studying chromosome behavior since the late 19th century. Why did it take until 1956 to figure out the correct human chromosome number, thanks to Joe Hin Tjio and Albert Levan?

The testimony of Ratherius of Verona, and of Abbo of Fleury, writers of the tenth century, goes also to prove that, even then, the question of reducing the duration of the Advent fast by one-third ...

Historic Jeddah is situated on the eastern shore of the Red Sea. From the 7th century AD it was established as a major port for Indian Ocean trade routes, channelling goods to Mecca. It was also the ...