Embryonic stem cells are undifferentiated cells that show promise in the treatment of heart disease, cancer, spinal cord injuries, diabetes and Parkinson's disease. For example, if stem cells are introduced into a patient's heart after a heart... | READ MORE >
In the late nineteenth and early twentieth centuries, sex education in the United States was strongly informed by Victorian values. For instance, sex education of the time taught that sexually transmitted diseases were the result of punishment for... | READ MORE >
Much of the 3,000-mile (4,828kilometer) Great Wall of China was constructed during the Ming Dynasty (1368-1644) [see timeline of Chinese history] to prevent attacks from rival forces, although officials as early as the fifth century BCE also built... | READ MORE >
