Cruciferous vegetables accumulate particularly high concentrations of the toxic bluish element thallium, atomic No. 81. However, these blue spheres are broccoli seeds.

Broccoli and Kale Taste Bitter

The golden age of nutrition bloomed in the twentieth century with discoveries of proteins, fats, carbohydrates, minerals, vitamins, and other plant (phyto)-derived chemicals required for human health. Accepted wisdom about these nutrients became, “if some is necessary, then more