Problem-based learning (PBL) is an instructional strategy of "active learning" often used in higher education in such fields as nursing, dentistry and agriculture. The modern history of PBL began at the medical school at McMaster University where Howard Barrow...

Thousands of years ago, Great Britain was joined to Europe and was covered with ice. About 15,000 years ago, the weather became warmer. The ice melted and the sea level rose. Great Britain became an island about 8000 years ago.   Celtic people called Briton...