Sarah, The short answer is that, yes, you can substitute butter for shortening in cookies. It will, however, change the texture and appearance of the end product. Because shortening is 100% fat and butter is roughly 85% fat and 15% water, cookies with butter in them tend to spread more during baking.
Usage: Yang is a popular first name. It is more often used as a boy (male) name. People having the name Yang are in general originating from China, France, South Korea, United States of America.
Dr. Yang accepted his initial postdoctoral position at Indiana University before eventually returning to China in 1989 to continue his postdoctoral work at Xiamen University. Dr. Yang currently performs research as a Professor at the Institutes of Biomedical Sciences, Fudan University in Shanghai, China.