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.
The president observed Epiphany in a freezing lake by a monastery, one of several increasingly prominent displays of religiosity in recent months.
A handful of national churches in Europe and elsewhere in the world are only getting ready to celebrate Christmas now.
The atheist group say the cost of transporting a holy flame from Israel to Greece should not be paid for by the state.
Ukraine's Orthodox Christians celebrate January 19 by immersing themselves in water.