With participation level at nearly a quarter of the population (22 percent), bowling rolled by such popular sports and activities as basketball (15 percent), golf (13 percent), aerobics (11.9 percent), baseball (13 percent) and yoga (9 percent) to secure the number one ranking.
Definition of FUEL CELL. : a device that continuously changes the chemical energy of a fuel (as hydrogen) and an oxidant directly into electrical energy.
stem cell. noun. Definition of stem cell for English Language Learners. : a simple cell in the body that is able to develop into any one of various kinds of cells (such as blood cells, skin cells, etc.)