[Zeneta]

Some medical advances.

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Some folks would still need to be bled.

[Harmless Teddy Bear]

Yes. My husband for example needs to be bled. Every quarter he needs to have a pint drained off to prevent a dangerous buildup of iron in his system.

I would also invent double entry book keeping.

Yes, I know that is something only an accountant knows about but it really did revolutionize business.