What are 21st century skills?

How historians measure time using chronology: AD, BC, CE, BCE, and numbering centuries

What are learning skills?

What are the 21st-century skills in education and why are they so important to teach?

7 Key Features of 21st Century Learning

A Comprehensive Guide to 21st Century Skills

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21st Century Skills (P21 and others)

Ten 21st-century Skills Every Student Needs