Some companies do test their products on people with skin problems.

"That is something we could not test here on earth."

He said the drug could not be tested on patients for at least a year.

I'll be an old man before we test it on an actual human.

We were able to test them on 80 different concepts each.

Even after testing it on other people, he couldn't have been sure.

He wants me to test it on you, to back up my article to the Journal.

But I had never meant to test this theory on myself.

Rather, they tested people on the street in small ways.

The next step will be to test the equipment on plants.