Science attempts to answer a vast range of questions about the natural world, from the very small to the incredibly large. Here are some broad categories and examples:

Questions about the physical world:

* How does the universe work? (Cosmology, astrophysics)

* What are the fundamental building blocks of matter? (Particle physics)

* How do living things evolve? (Evolutionary biology)

* What are the laws of motion and gravity? (Physics)

* How do ecosystems function? (Ecology)

* How does the Earth's climate change? (Climate science)

* How do chemicals interact? (Chemistry)

* How do materials behave under different conditions? (Materials science)

Questions about the human world:

* How does the human brain work? (Neuroscience)

* What are the causes and cures of diseases? (Medicine)

* How do societies function? (Social sciences)

* How do humans learn and develop? (Developmental psychology)

* What are the ethical implications of new technologies? (Bioethics)

* How can we create sustainable societies? (Environmental science)

Science also asks questions about:

* The origin of life. (Origins of life research)

* The existence of extraterrestrial life. (Astrobiology)

* The nature of consciousness. (Neuroscience, philosophy)

Key characteristics of scientific questions:

* Testable: They can be investigated through experiments or observations.

* Empirical: They are based on evidence from the natural world.

* Objective: They seek to understand reality without bias.

* Falsifiable: They can be proven wrong with evidence.

It's important to remember that science doesn't have all the answers. Some questions are too complex or require further research. Science is a constantly evolving process of discovery, where new questions arise as old ones are answered.