For thousands of years, civilizations around the world have built houses out of earth – whether it be mud brick, wattle and dab or rammed earth. But adobe (the practice of making mudbricks) has now be...

The twisty, crunchy, doughy treat is a tradition in Philadelphia, and the Center City Soft Pretzel Company churns out tens of thousands of pretzels a week. Correspondent Susan Spencer checks out their...