It's better for him not to know the truth. After all, ignorance is bliss.

He is looking for a proving ground to test his new theory.

These test results are showing unexpected outcomes.

We analyzed the data of the experimental group.

He has a deep interest in empirical science.

This project is still in the experimental stage.

Animal experiments are necessary for the advancement of science, but there are also ethical issues.

Nuclear tests pose a great threat to world peace.

This is our new experimental project.

These experimental results support our hypothesis.