When a scientist is applying knowledge from her degree to create something, she is using capital.
a. human
b. mental
c. physical
d. personal

She is using human capital. Human capital is basically passing on one person's knowledge and life experiences to others.

When a scientist is using his knowledge from what she learned to create something, that is called that she is using human capital. That is when you use something from what you have learned or degree to create something new.