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Organic: a ton of copper replacing a gram of glyphosate.

Also, glyphosate.

Probably, meat.

Humans have ate meat for thousands and years. They did not cost stuff in radium for thousands of years.

Carbon nanotubes and other nanoparticles probably. They have similar properties to asbestos when they get into your body.

C60 Fullerene being an exception to the rule.

Here's one where I think we very recently passed through the inflection point of cringe-worthiness: putting tiny plastic beads into body wash and facial scrubs in order to exfoliate your skin better.

http://www.popsci.com/what-are-microbeads-and-why-are-they-i...

Pesticides and artificial sugars would be my guess.

I suspect that certain combinations of seemingly safe chemicals cause cancer only if used together.

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