When the president of the company that made DDT testified before Congress he had a bowl of DDT on the table. Once in a while he swallowed a teaspoon of it in a vain attempt to show it was harmless.
First, Rachel Carson is probably responsible for more deaths than Hitler and Stalin combined, not that she meant to, but via malaria which had been controlled by DDT and now isn’t.
Secondly, there was a professor in California who ate a pound of the stuff to show it was harmless to humans. When I told my junior high students this (their history book had a glowing bit on Rachel Carson) they’d ask “What happened?”
“He died...”, I’d answer, “...thirty years later while climbing a mountain while in his 80s”. Thus ended the lesson for the day.