  Gender inequalities in science have long been observed globally. Studies have
demonstrated it through survey data or published literature, focusing on the
interests of subjects or authors; few, however, examined the manifestation of
gender inequalities on researchers' knowledge status. This study analyzes the
relationship between regional and gender identities, topics, and knowledge
status while revealing the female labor division in science and scientific
research using online Q&A from researchers. We find that gender inequalities
are merged with both regional-specific characteristics and global common
patterns. Women's field and topic distribution within fields are influenced by
regions, yet the prevalent topics are consistent in all regions. Women are more
involved in specific topics, particularly topics about experiments with weaker
levels of knowledge and they are of less assistance. To promote inequality in
science, the scientific community should pay more attention to reducing the
knowledge gap and encourage women to work on unexplored topics and areas.
