This week's Friday Brain-teaser from xrefer tests your knowledge of hobbies. Answers here

1. A discophile collects and studies what?
2. What is the hobby of someone who is called a "twitcher"?
3. Bibliophily means collecting what?
4. Philately means collecting what?
5. What is studied or collected by a lepidopterist?
6. Numismatics means collecting what?
7. Campanology is the art of doing what?
8. Cartophily means collecting what?
9. Ikebana is the Japanese art of arranging what?
10. Oology means collecting what?