When Colgate was developing its new low-waste Keep toothbrush, which has a reusable aluminum handle and replaceable heads (a starter pack costs $9.99; additional heads are $4.99 for two), the company ...
Katherine Martinko is an expert in sustainable living. She holds a degree in English Literature and History from the University of Toronto. Haley Mast is a freelance writer, fact-checker, and small ...
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