Solids, liquids and gases. In a solid like this brick, the particles are regularly arranged touching their neighbours and move only by vibrating. This explains why solids have a fixed shape.

Instead of hollow-core doors, you need solid core doors. They provide much better sound resistance while being more sturdy and durable. These aren't the only two kinds of doors, mind you — there ...

One minute, you're sure you'll go with quartz, but before the ink dries on your decision, you've joined the solid surface bandwagon. Of course, it is your kitchen, and you'll have to put in what ...