1. Stirring up forgotten lead: Smelters across US at risk from tornadoes, floods, quakes

2. Water quality tests data shows elevated lead levels in Toronto homes

Thirteen per cent of household water tests conducted in Toronto over the past six years showed unsafe levels of lead.

3. Virus experiments risk unleashing global pandemic, study warns

Scientists examine specimens of the 1918 pandemic influenza virus in the US. Photograph: Reuters

4.

 Five years after Brazil won its Olympic bid, athletes have condemned the site of the Olympic sailing and windsurfing events as a ‘dump’

5. Hungry for a helping of test tube meat? Maybe you should be

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)

6. Probe finds scant oversight of chemical plants

7. Charismatic Minifauna

Will We Still Have Fruit if Bees Die Off?

8. In Utah Boom Town, a Spike in Infant Deaths Raises Questions

9. I Don’t Want To Be Right

10. Tons of drowned livestock pose health threat in flood-hit Balkans; army decontaminates areas

11. Timely cleanup unlikely at state’s hazardous waste sites

12. N.C. panel OKs criminalizing disclosure of chemicals in fracking