Dr. Mark Davis

Over the past few decades, an incredible amount of time and money has been spent trying to remove populations of "non-native" plants. But according to a panel of ecologists, climate change, urbanization and other changes in land use have largely invalidated the theory that foreign plants are inherently harmful to their newly adopted ecosystems.

Dr. Mark Davis was enjoying a successful career as a chemical engineer, until his wife was diagnosed with breast cancer. Now, ten years later, he’s created a revolutionary nanoparticle drug that has reversed terminal cancer in one test patient. This story is featured in "Curious," a series co-produced by Thirteen/WNET. ...