June 4, 2006, 10:44pm

Maybe I will need to read this book...

A Briefer History of Time.

http://www.amazon.com/gp/product/0553804367/104-5691153-7558353?v=glance&n=283155

Have been reading about longitudinal studies in developmental psychology, that studies aim at studying changes in time...

Yet, what is time? Is it OK to measure age to study changes in time? What is age?