Possible cluster preformation in the $^{14}$C decay of $^{223}$Ra

We try here to discuss how research about the uses of technologies moved in the last years, from questions like : do we learn better with technologies? Or : how technologies determine evolutions of society? to other questions, about complexity of construction of social knowledge. Qualitative research, based on a diversity of local situations (for example what happens in musems, in libraries, at home?), was very important in this evolution.