This is known as a chemical change. The other kind of change in chemistry is a physical change, which is when a substance changes without becoming a new chemical. These physical changes are often ...

Correspondence to Dr Kirsten Corder, MRC Epidemiology Unit University of Cambridge School of Clinical Medicine Box 285, Institute of Metabolic Science Cambridge Biomedical Campus Cambridge CB2 0QQ UK; ...

By integrating 30 minutes a day of progressive walking exercise into standard stroke rehabilitation (30 to 60 minutes of physical therapy five days a week) stroke patients had a measurable improved ...