Maya
slavery was not an "invention"
the Gregorian calendar
Thomas Crapper was given credit for it but it was Sir John Harrington's idea.
Properly speaking, there is no "English" calendar system. You probably mean the predominant Western Calendar (also called the Christian Calendar). This calendar system is best called the "Gregorian Calendar", after Pope Gregory XIII who introduced the calendar system in 1582.
It is the Gregorian calendar.
when and where computer first time inveted
Alana Goodie Inveted Texting
Steve Jobs inveted apple computers. he inveted everthing apple
me
== ==
i did
1972
a
It is unknown.
galileo
1895
Japan.