BRISBANE, Australia, April 13 -- The University of Queensland posted the following news: * * * Leafy vegetables identified as potential metal mining tools * Leafy vegetables could be used to extract toxic metals from contaminated soil for use in medical technologies and energy projects. Key points * Certain plants are 'hyperaccumulators' that can extract toxic yet valuable metals from contaminated soils through their roots and shoots * Brassicaceae species such as kale, cabbage, broccoli, cauliflower, mustard, and Brussels sprouts a more PR