Physical activity stimulates brain function " in some ways that we don 't totally understand , " albert said .
艾伯特说,体力活动剌激脑功能,“在某些方面,我们还不完全地了解。”
It was believed in the 1890s that there were just a few problems left to solve in physics : yet albert einstein solved three of them in 1905 , and founded three new branches of physics .
Albert described a randomized controlled clinical trial involving about 3000 elderly persons in which researchers tested the value of training exercises to help improve or maintain memory , reasoning abilities , and mental speed .