To him the most dangerous experiments or missions were simply jobs that had to be done.

They were about to embark on one of the most dangerous experiments he had ever tried!

Somehow, he had talked the other man into the dangerous experiment.

In November 1940 a grand, dangerous experiment had been conducted.

And anything that includes a dangerous experiment must be out, too.

Without special expertise and equipment this is a very dangerous experiment.

Most of the more dangerous experiments he performed on himself.

His dangerous little experiment was running now and couldn't very well be stopped.

I cannot stress enough, just how dangerous the experiment is that you are planning.

"And they have been a source of courage during my most dangerous experiments."