Library.

“Exposure to full moonlight overnight causes razor blades left outside to become dull.”

This is a folk myth with no scientific basis. Moonlight is reflected sunlight roughly 400,000 times weaker than direct sunlight — far too feeble to alter steel or drive meaningful oxidation overnight. Peer-reviewed MIT research shows razor blades dull through mechanical microchipping during use, not passive light exposure. No credible scientific study has ever demonstrated that moonlight dulls blades. The only "evidence" cited in support comes from anonymous forum posts proposing physically impossible mechanisms.

“The human stomach can dissolve razor blades through its digestive acids.”

This claim is false as commonly understood. While stomach acid (pH ~1–2) is highly corrosive and can slowly corrode metal in laboratory settings — one study showed ~37% mass loss after 24 hours in simulated gastric juice — food and foreign objects typically remain in the stomach for only 30–120 minutes. Medical case reports consistently show ingested razor blades passing through or being surgically removed intact, not dissolved. The claim conflates a lab demonstration of slow corrosion with actual digestive capability.