Tissue engineering is the development of biological substitutes to repair or replace damaged tissue or organs. It is an interdisciplinary field based on life science and engineering principles and relies on the use of living cells as engineering materials. The process begins with the extraction and cultivation of cells, which may later be transferred to a scaffold that helps them develop the proper structure. Finally, the tissue is implanted in the patient. What materials are used for scaffolds?
Back in the day
Reaching 27,890 ft (8,501 m), Lhotse is the fourth highest mountain on Earth. Tibetan for "south peak," it is located in the Himalayas on the Nepal-Tibet border and is connected to Mount Everest by a 25,000-ft (7,620-m) ridge. The first ascent of the mountain was made by Swiss climbers Fritz Luchsinger and Ernest Reiss in 1956. Thirty years later, what mountaineer summited Lhotse, becoming the first climber to have ascended all 14 mountains on Earth that peak more than 8,000 m above sea level?
Born on a day like today
Käsebier was one of the most influential American photographers of the early 20th century and a promoter of photography as a career for women. She photographed famous figures like the sculptor Auguste Rodin and American showman Buffalo Bill, but she is best known for her evocative images of motherhood and portraits of Native Americans. In 1899, Alfred Stieglitz declared her "the leading artistic portrait photographer of the day," but a decade later, he was speaking out against her work. Why?