Winter Solstice challenge starts tomorrow!
Tomorrow, December 11th, at 22:23 UTC, PrimeGrid's 10 day Winter Solstice Challenge will begin. The challenge ends on the moment of Winter Solstice itself, when the Earth's Northern pole has its maximum tilt away from the Sun and the Sun shines directly over the Tropic of Capricorn. Please join us in celebrating by crunching some GFN-21 tasks! Details and discussion about the challenge can be found here: http://www.primegrid.com/forum_thread.php?id=8326.

More...