31.   Research on natural hazards has a long tradition in geography going back more than half a century.

32.   Research on solar-cell design has recently shown us how to make extremely lightweight solar cells.

33.   Scientists are doing research on two types of vaccine.

34.   Social-science research on stepparent families has underscored the point that biological ties are surprisingly difficult to duplicate.

35.   Tell her you have already done some research on it but have some questions about a particular area.

36.   Textbooks on research methods rarely mention the problems that arise when undertaking research on controversial topics or conducting it in sensitive locations.

37.   The article made no reference to previous research on the subject.

38.   The Garden produces the Edinburgh Journal of Botany, which publishes research on plant taxonomy and other botanical sciences.