• Inconstant wind: storm Idai crossed Mozambique into Malawi and went back out to sea. Then, upgraded to a cyclone, it crossed Mozambique to Zimbabwe (23 March, p 6).
• They’ve really made the grade: it is the US space agency NASA that has a training cohort of whom half are women (23 March, p 24).
• For tropical use: we have posted a corrected map showing the number of minutes’ sun you need to get your daily vitamin D at different latitudes at bit.ly/NS-sun (16 March, p 28).
