100 years ago, scientists were allowed to mail each other this dangerous thing that would be 100% illegal today. What was it?

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<p>100 years ago, scientists were allowed to mail each other this dangerous thing that would be 100% illegal today. What was it?</p><p>See <a href="https://omnystudio.com/listener">omnystudio.com/listener</a> for privacy information.</p>

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