Plants need nitrates for good growth, but they can also accumulate in leaves of crops like rocket. So are foods like this safe to eat, wonders James Wong
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https://www.newscientist.com/article/2238043-is-your-salad-going-to-kill-you/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home
