1. experiments
The astronaut had to conduct many experiments in the space shuttle.
People could have avoided many mistakes by simple experiments.
He is carrying out experiments in his laboratory.
Those two experiments yielded similar results.
They conducted a series of experiments under zero gravity.
Experiments are carried out in a laboratory.
Experiments will enable you to find out what is wrong.
Furthermore, experiments were never carried out against the rules but were performed always well within them - otherwise they would not be recognized as experiments at all.
He turned to his orange juice sullenly, sneering that every little additive would sign him up for experiments he wanted no part in.
In my understanding, those two experiments do not have common factors.
Psychology, which studies the human mind and human behavior, builds knowledge by observation and experiments.
Although I broke test tubes and played about with chemicals for fun, I did occasionally manage to obey the teacher's instructions as well; repeating experiments that others had long ago undertaken.
The scientist maintained that the theory should be tested through experiments.
I was not being taught to experiment or even to repeat experiments.
Our hypothesis is based on thorough experiments.