This is a tricky question! Scientists can do a LOT, but they are limited by the nature of science itself. Here's how to break it down:

* What scientists CAN do:

* Observe and describe the natural world: They use their senses, tools, and experiments to gather data about the universe.

* Develop explanations for natural phenomena: Scientists use evidence to propose theories and models that explain how things work.

* Test and refine these explanations: Through rigorous experiments and data analysis, they constantly evaluate and improve their understanding.

* Make predictions about future events: Based on their understanding, they can make educated guesses about what might happen.

* Develop technologies: Scientific knowledge leads to inventions that improve our lives.

* What scientists CANNOT do:

* Prove things with absolute certainty: Science is based on evidence and is always open to new discoveries. No scientific theory is ever "proven" in a way that leaves no room for doubt.

* Solve all problems: While science has given us incredible solutions, some challenges are beyond the scope of scientific inquiry (e.g., ethical dilemmas, philosophical questions).

* Control all aspects of nature: The natural world is complex and often unpredictable, and there are limits to our ability to control it.

* Force people to accept their findings: Scientific evidence is presented, but ultimately, people have the right to decide what they believe.

Therefore, the most accurate answer to your question is that scientists cannot "prove things with absolute certainty." Science is a process of continuous learning and refinement, and the pursuit of absolute certainty is not its goal.