750 marked the beginning of the Middle Ages across all civilizations. This year marked the end of late antiquity and classical world
Umayyads were leading Quraysh tribe clan in Mecca. Muhammad gave Umayyads position after capturing Mecca in 630. Umar established hereditary rule with Muawiya as caliph in 661. Muawiya conquered Cyprus, Crete, Rhodes and Sicily
1000 was a leap year starting on Monday of Julian calendar. World population estimated between 250 and 310 million. Gregorian calendar was 5 days ahead of Julian calendar
Virtual keyboards enable input on devices without physical keyboards. IBM patented optical keyboard in 2008 using hand movements. Virtual keyboards can replace mechanical input devices. Various types include physical keyboards with electronic displays