After a lifetime crouching over charcoal stoves in cramped, airless huts, many Tanzanian women find the whites of their eyes are stained red by the time they hit sixty. In rural areas, where superstition is rife and education poor, these women might be decried as witches, and brutally murdered by fearful neighbours. This practice is not unusual. Far worse though, and a much greater killer, is the stealthy poison which causes the reddening of the eyes � toxic air pollution which a large proportion of women and children are exposed to every day. The World Health Organisation has described the indoor air pollution from smoke fumes as a worse threat to life than TB or malaria across many developing countries, where the money to improve cooking conditions for the average family simply doesn't exist. Thankfully, efforts to find more economical and environmentally-sound stoves have turned up alternatives which are also easier on the lungs and eyes.