National Geographic Desk Reference to Nature's Medicine, by Steven Foster & Rebecca Johnson. For millennia, humans have looked to nature for remedies to ailments. Long before formal science enabled us to take a systematic approach to medicine, healers used plants to alleviate pain, ease the symptoms of dozens of diseases, and treat complaints of every kind. And today, countless people still use medicinal plants, in traditional roles and as building blocks for new research and innovative drugs. Desk Reference, Early Pregnancy Signs, Medicine Book, Pregnancy Signs, Evil Spirits, Healthy Pregnancy, Medicinal Plants, Natural Medicine, Herbal Medicine