This is a bit of a trick question! It depends on what you mean by "scientists."

Here's why:

* Scientists are diverse: We have scientists studying everything from the tiniest atoms to the vast universe. Their skills and focuses are very different.

* "Except" implies limitation: The question is asking what ALL scientists cannot do.

Possible Answers:

Here are a few things scientists *might* not be able to do:

* Predict the future with certainty: While science can help us understand patterns and make informed predictions, it cannot guarantee the future.

* Control all aspects of nature: We can influence some natural processes, but we cannot control everything.

* Solve all the world's problems: Science is powerful, but it's not a magic solution to everything. Social, ethical, and political factors also play a role.

Let's rephrase the question to be more specific. For example:

* What can all biologists not do?

* What can all physicists not do?

This will help narrow down the possibilities and give you a clearer answer.