'I'll interview you in a minute,' a man with a dictaphone said to me at the entrance to the Science Museum on Saturday. A sociologist from Brunel University, he was there to conduct field research, asking people why they were on the March for Science. The crowd – archaeologists and neuroscientists, physicists and psychologists, academics and the 'sci-curious' – was quieter than the average London protest, chanting occasionally: 'What do we want? Evidence-based research. When do we want it? After peer review.'

