Here are 5 jokes:

1. Why did the scarecrow win an award? Because he was outstanding in his field.
2. I'm reading a book about anti-gravity. It's impossible to put down.
3. What do you call a fake noodle? An impasta.
4. Why don't skeletons fight each other? They don't have the guts.
5. I used to hate facial hair, but then it grew on me.

All 5 are unique.

1. Why don't scientists trust atoms? Because they make up everything!
2. I told my wife she was drawing her eyebrows too high. She looked surprised.
3. Why did the scarecrow win an award? Because he was outstanding in his field!
4. Did you hear about the mathematician who's afraid of negative numbers? He'll stop at nothing to avoid them.
5. I used to play piano by ear, but now I use my hands.

Unique count: 5/5 (All jokes are distinct in structure, topic, and punchline).