Can you see underwater? How fast do fingernails grow? Can you make a frog hibernate? How is a storage cell put together?"" The answers to these and a score of additional questions can be found through active experimentation. Mr. Barr once again invites the young scientist to prove and discover, discard and define a multitude of scientific phenomena by enlisting the aid of simple materials and his powers of observation. Chemistry, astronomy, magnetism and electricity, weather, water, your body, living things, sound and light and measurement are the general categories into which we delve. The active participation necessary for appreciation here will ensure reinforced learning.