0_Apprentice
My brother is into entomology. Do you know much about it?
1_Wizard
I know that it is the study of insects, which is a branch of zoology.  Did he go to college for it, or is it just a pasttime for him?
0_Apprentice
It is just a pastime for him, but he also has considered taking classes for it so he can go into it professionally. 
1_Wizard
There are 1.3 million species of insects, so there is a lot for him to study if he chooses to.
0_Apprentice
I had no idea there were so many
1_Wizard
And it also overlaps with a lot of other topics like genetics, biochemistry, ecology, biology, and even paleontology - he may need a graduate degree to be able to work in this field.