What do embalming fluid, your go‑to lipstick, and the floor beneath your feet all share?   They can all release formaldehyde—yes, the very same chemical. And it doesn’t stop there: your gym leggings might be laced with hidden toxins, while that dusty bookshelf could be hiding microplastics. Shocking? You’re definitely not alone. That’s why we’ve pulled together 15 surprising facts you probably never knew—plus simple, practical tips to help you cut down your exposure.