10. What’s It Like to Be Killed by Nature’s Most Brutal Predator

There is a hidden world filled with monsters you never heard of, from predators who spit acid and shoot harpoons, to armored hunters that devour their prey alive. Deep in the oceans, and even in fresh water from puddles and lakes, these microscopic super predators remained hidden in plain sight, and evolved over the last 2 billion years. What are the deadliest predators of the microworld, and what kind of bizarre biological weapons have they evolved over the past billions of years?