A team of researchers at the Massachusetts Institute of Technology investigated whether the ancient Egyptians could have used a synthetic concrete for the huge stones used in building the pyramids. The theory has met enormous resistance...

A review of the events in the life of Anne Hutchinson, a brave, early American settler. Learn how Anne Hutchinson felt about religion and the way people should worship God. (In Spanish)

This interesting encyclopedia entry tells about Paul Cuffe, a black abolitionist and philanthropist who attempted to form a colony in Africa for freed slaves.