Thirteen per cent of household water tests conducted in Toronto over the past six years showed unsafe levels of lead.
Scientists examine specimens of the 1918 pandemic influenza virus in the US. Photograph: Reuters
Lab-cultured meat, raised from stem cells, may provide the world with a plentiful, ecologically beneficial and humane source of protein, scientists say. (Krista Simmons / For The Times)
7. Charismatic Minifauna