Here are the science topics at GM Arts:
Calendar and Easter Dating
Calendar & Easter Dating History.
Definitions and myths on how Easter date is determined.
Easter date lists, a calculator and algorithms.
Also, a perpetual calendar.
A lay-persons guide to how relativity works, with pictures of a scenario where a twin travels on a fast space voyage to return later to Earth and discover her twin sister has aged more than she has.
Strange but true!