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" ... Afterward, the room was darkened. Under ultraviolet light, experimenters were able to observe that traces of the glowing paint had spread among the participants, on the table and elsewhere. ... "
" ... Ms Bastos and her three experimenters conducted a series of three experiments that varied the ratios of orange to black tokens in two transparent jars and the experimental conditions. Basically, the kea watched the experimenter take a token from each jar and conceal it in a closed hand. The study kea chose one of the two hands by tapping on it and was given the concealed token. If the kea got a rewarding (black) token, he could exchange it with the experimenter for a food reward. On the other hand, if the study subjects got a non-rewarding (orange) token, this was collected by the experimenter but not rewarded. Each experimental session consisted of 20 trials. ... "
" ... On a review of the literature, Lowe notes that the vast majority of the work has been theoretical, which seems sensible. However, a few experimenters have had a go with dioxygen difluoride and survived. The most extensive work appears to have been done in the 1960s by a certain A. G. Streng working at Temple University. Lowe lists with incredulity all the substances he managed to react with it: ... "
" ... That, at least, is what the economist Yossef Tobol at the Jerusalem College of Technology and his colleagues found in a recent study published in the journal Economic Letters. Their study was conducted in June of 2020 in Israel, at a time when masks had to be worn outside and violators were given a hefty fine by the police. The experimenters recruited 100 people on the street to be in the study who were wearing their mask properly, along with 100 people only wearing their mask on their chin or neck. ... "
" ... What the experimenters did was set up a photon-emitting source within a vertical tower, and then put that same material at the other end of the tower. If there were no gravitational redshift — i.e., if time ran at the same rate for everyone — then the material at the other end of the tower should absorb the photons emitted from the first end. ... "