5. Antó, Sunyer, et al. Lancet 1986;1:900-3

6. Antó, Sunyer, et al. Lancet 1986;1:900-3

12. Flickr: winemegup

14. More than 25m people in the US have asthma. 60-75% of people with asthma do not have symptoms under control. Asthma now costs $56b each year in the US.

19. “ Either way, the upshot would be better lives for patients in the short term and, if all went well, a true understanding of the triggers of this debilitating and occasionally life-threatening condition.”

20. Steven Dean Twitter: @sgdean