Sentence examples similar to do these experiments occur from inspiring English sources

In order to do these experiments, naturally occurring gadolinium could not be used due to its overwhelming neutron scattering cross-section, and the researchers used instead a costly isotope known as gadolinium -160.

But what do these "experiments" tell us?

-Where do these accidents occur?

When do these typically occur?

Why do these bailouts occur?

Why do these differences occur?

How do these conversions occur?

How do these scenarios occur?

And where do these deaths occur?

And where do these killings occur?

How do these variants occur?