Read in-depth about forest health – from invasive pests and diseases to regeneration – in this Special Issue: Forest Health from Science, a magazine published by the American Association for the Advancement of Science (AAAS). Researchers are constantly trying to understand and monitor the health of forests given the world’s changing ecosystems and human behavior. Learn about methods being employed to protect forest health, for example, forest managers are releasing predatory insects to eat and hopefully defeat the widespread infestation of Eastern Hemlock conifers by tiny sap-sucking insects called hemlock woolly adelgid.