How to use "experiments" in a sentence

Sentences

Recombinant DNA experiments

I only know that he was about to start experiments he had been preparing for some months

Do you know if your brother ever did any experiments with flies?'

For a year before his death, my husband had told me about some of his experiments

It was the first time he told me about his experiments and he came running into the house and threw the ashtray into my hands.