How to tell if your textbook is biased: #1
Found on page two of my history textbook:
For time periods more recent than 20,000 years ago, we usually adopt the notation "B.C.E." (Before the Common Era) and "C.E." (Common Era). These designations correspond exactly to the more familiar "B.C." (Before Christ) and "A.D." (Anno Domini, "in the year of our Lord"), but remove the specific reference to a single religion. For dates more than 20,000 years ago, "B.P." (Before the Present) is sometimes used.