What is the hobby of write’s father

My father has an unusual hobby, carving eggshells. As everyone knows, carving eggshells is very difficult, eggshells are very fragile. My dad can make because pieces of art from empty eggshells. It’s amazing. He started the hobby five years ago after a trip to the US where he saw some carved eggshells in an art gallery. My father did not go to class to learn how to carve. He learned everything from the Internet.

1. What is the hobby of write’s father?

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2. When did he start the hobby?

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3. Why is carving eggshells difficult?

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4. Did he go to class to learn how to carve?
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