An invasive species known as the "bur cucumber" is spreading across South Korea, its vines slowly choking the trees they attach to. Broadcaster MBC sounds the alarm in this report.

What do plants, snakes, molds, marine sponges, and cone snails have in common? They have helped develop medicines that save human lives. Biodiversity -- the variety of life on Earth -- is key to human survival. But plants, animals, and microorgani...