Credit: Alex Kritchevsky

Essay: Biking in dirty air

A PhD student studying toxicology considers whether the benefits of bike commuting outweigh the risks from breathing polluted air

I see toxic chemicals everywhere.

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Can low doses of chemicals affect your health? A new report weighs the evidence.

Toxicology’s founding father, Paracelsus, is famous for proclaiming that “the dose makes the poison.” This phrase represents a pillar of traditional toxicology: Essentially, chemicals are harmful only at high enough doses.

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