I love photography.  What is your favorite hobby?
Photography is absolutely one of my favorites too! It's both a hobby, a science, and even an art arguably.
Definitely a science because of the chemistry of photo developing.  I love taking pictures of nature.  What are your favorite things to photograph?
Probably nature and birds. One thing about photography that is great is that it is employed in so many fields, like science and manufacturing.
That is very true.  I really like birds, too. Especially birds of prey such as falcons and hawks.  
Me too, they're so fierce looking. For a while I never knew what a negative was for, but its to create a positive image on a paper base.
Do you remember when we used to have to take our film to stores to get developed?  I did not know that was the purpose of the negatives.
I know right? It's crazy how far we have come to now having electronic image sensors instead.