Things that set Jack Stack apart include a hostess stand, wine list, bar with trendy cocktails, waiter service, nice utensils, plates, cloth napkins and a lengthy menu.
The researchers twigged that this phenomenon could be used to measure density and, as they report in the Journal of Agricultural and Food Chemistry, they set about this task by erecting a stack of two off-the-shelf neodymium magnets separated by a vertical vial of paramagnetic fluid.