the bacteria that causes tetanus - clostridium tetani - is an anaerobic (can't survive in the air) organism. it lives in dirt.

its spores can survive for long periods in air.

i'm not clear under what circumstances one would find the bacterium / spores on a razor. unless it wasn't cleaned before use.

where's the science?

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“Everyone should have a horse. It is a great way to store meat without refrigeration. Just don’t ever get on one.”
- ponder's dad