Science
Eco-friendly cement from old toilets? 15-year-old sends Swiss army knife into stratosphere Robot 'soldier' to help develop protective gear New stars being born at our galaxy's edge 3D structure of malaria parasite genome generated		Now, Britons can buy HIV testing kits over the counter Junk food may make you lazy Celestial spectacle: Mars to swing closer to earth this week The weed that causes cancer may well kill it New heart valve does not require open surgery