But the additional density that TOD allows is predicated on ... Keegan’s biweekly architecture column is supported by a grant from former Tribune critic Blair Kamin, as administered by the ...

Gravity doesn’t care if you trip. Density columns have many layers of liquids that sit on top of each other, but if you accidentally mix them up, most will settle into just two layers. You can shake ...

A hydrometer measures the relative density of different liquids. When an object floats in a liquid—when it is neutrally buoyant—the upward force of the liquid perfectly balances the downward force of ...