Evolution
The theory of evolution says that a simple system evolves into a more complex system. What is then the next level of evolution? If we carefully look into the way the higher systems evolved, the evolved system never replaced the earlier one. Even though the entire life has evolved from the amino acids and single cells, the singles cells, monkeys and human all exist. This means the next complex evolution whichever is going to result we (homo sapiens will also co-exist). Another thought, when the first modernised man showed up and whatever we are today, there is a tremendous change for better or progress. Should we call this as evolution, because the thinking is becoming revolutionised. But the next evolution is still a question to be answered!