According to Wikipedia the “egg was a symbol of the rebirth of the earth in celebrations of spring and was adopted by early Christians as a symbol of the resurrection of Jesus.”
One more thing I discovered today is that unlike in Nigeria, Easter Monday is not a public holiday. It’s a good thing that I’ve discovered this early enough to send an email to tell my students that contrary to an earlier one wishing them a good work-free Monday, we will be meeting in class. Sigh. The life of an American professor. I can’t complain though. 😀