An Experiment
An experiment is a controlled test designed specifically to prove or disprove a hypothesis.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"All sizes | Keep Out Experiment In Progress | Flickr - Photo Sharing!."
http://www.flickr.com/photos/jurvetson/2798315677/sizes/l/
Flickr
CC BY.