California’s historic drought may be over, but scientists are still hard at work assessing its impact on the ecosystem. Perhaps nowhere is that work more interesting, or important, than with the Sierra’s Giant Sequoias. These ancient trees have weathered drought, fires and floods for millennia. But how did they fare in this most recent dry spell, and what can their health tell us about other problems in the forest? That’s the subject of new research from UC Merced’s Sierra Nevada Research Institute. The group's director Roger Bales joined us on Valley Edition to explain that while most sequoias made it through this drought, a longer one in the future could threaten many groves.