And, in the first ever large-scale experiment of its kind, we used people power to try to bring about a quantifiable improvement in air quality for a single day.

Large-scale experiments were done in the 1970s, including team teaching and open classrooms.

Models enable researchers to simulate large-scale experiments that would be too costly or unethical to perform on a real ecosystem.

Bell directed large-scale experiments at a cost of up to 50,000, resulting in a basic steel process which produced steel rails containing no more than 0.07% phosphorus.