We have been saying for a while that polycarbonates bottles can leach Bisphenol A, a gender bender chemical, and that it was time to ditch them; now a new University of Cincinnati study shows that the temperature of the liquid inside has the most impact on how much BPA is released. According to Martin Mittelstaedt of the Globe and Mail, "Adding boiling water to polycarbonate plastic bottles causes a dramatic spike (55 times as much!) VIA-hugg.com (Link)