ll plants absorb minerals like iron, magnesium, and copper from the soil through their roots, dispersing them in various amounts throughout their stems, leaves, and fruit. If you put a particularly mineral-rich vegetable, like slices of bell pepper, in the microwave (without extra water, which helps to dampen the effect), the electrical charge is in the perfect place for arcing. That's because not only are there many tiny metal particles ready boost their local electrical field, but there's uneven geometry — in the pepper's bumpy interior, in its awkward shape, and in the angles left by the knife — ready to carry that charge to a nearby surface. Boom, sparks fly. Same goes for greens like brussels sprouts and kale, which are rich in both iron and wrinkly surfaces.
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