By Clothilde Goujard
Thousands of small test tubes were set up in neatly organized rows in the cupboards of Armand Séguin’s laboratory.
Soon, the scientist would be filling them up with sap squeezed from the bark of ash trees.
Séguin has been studying cancer for more than two decades. Now he's turned his expertise to stopping the spread of the destructive emerald ash borer, a green metallic-looking beetle that is smaller than a fingernail.