Despite a tremendous amount of scientific study, many outstanding mysteries still surround the way in which cells in living tissue respond to and repair physical damage. (sciencedaily.com)
Measurements of the gravity and composition in that zone will help solve outstanding mysteries. (sciencenews.org)
More recently black holes (schematic of one shown) have been used as thought - experiment laboratories for investigating several outstanding mysteries about the nature of space and time. (sciencenews.org)