The human race has invented nearly every toxin imaginable. In our food, there are chemicals that kill pests, make foods ripen faster and grow bigger, and lengthen shelf life. In our clothing, chemicals make fabrics soft, keep them from wrinkling, make them fire retardant and resistant to stains, and keep them from collecting static. In our kitchens and bathrooms, chemicals create suds, remove grease, stiffen our hair, make our skin feel smooth, stop us from perspiring, change our hair color, lengthen our lashes, and make us smell good.

Unfortunately, many of these chemicals, designed to...