Focused Ultrasound Surgery
Credit: Paramount Pictures

 
This surgical technique is a non-invasive way to destroy unwanted masses within the body (like uterine fibroids) without harming the surrounding tissues. I seem to recall Dr. McCoy touting the advantages of doing surgery without using knives decades ago. On one occasion, he saved Chekov with a nifty little non-invasive surgery device (see photo), saying "Put away your butcher knives and let me save this patient before it's too late!"
Number 3: Transparent Aluminum Armor
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