The most important finger is your thumb
You can't do this without it
1. Hold a plate
2. Carry a cup
3. Hold a guitar neck
4. Hold a book
5. Use fork and knife in a convenient way
6. Open a bottle cap
7. Check the size of the mushroom cloud from an atomic bomb
you're supposed to stick your arm out and hold your thumb over the cloud.
8. Type on your phone
9. Move the objects
Like a chair
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