The letter is the oldest known Christian documentary evidence from the Roman province of Egypt, providing fascinating details about some of the earliest adherents to the religion.
Researchers say their findings at the 'Ein Qashish site show open-air sites may have been more important to Neanderthals than previously thought.
At least 170 of the 4,500 manuscripts in Egypt's Sacred Monastery of the God-Trodden Mount Sinai have text invisible to the naked eye.
Did the Germans create Egypt's new "Frankenstein"?
Zeno, Epictetus, Seneca and Marcus Aurelius, the great Stoic philosophers of the classical world, are back in vogue
The head of UNESCO has lambasted the desecration of historic and religious sites by ISIS, comparing them to the Nazis
The find refutes earlier ideas about humanity's ability to adapt to altitude.