A scientific journal sparked a Twitter firestorm when it rejected two female scientists' work partly because the paper they submitted did not have male co-authors. Evolutionary geneticists Fiona Ingleby and Megan Head collaborated on a study of gender bias in academia. They found that women with a PhD in biology published fewer articles than their male peers, which the authors argued showed gender bias, reports Times Higher Education. When the women submitted the study to peer-reviewed journal PLOS ONE, a male reviewer came back with some pretty shocking suggestions.