Avoid preheating the oven unless your recipe specifically calls for it.

Not just the fiber that makes leisure suits and gauchos possible, polyester has long outlasted those misguided fashion statements from the '70s. The term refers to a whole family of petroleum-based plastic polymers. As a fiber, it is used to make resilient, low-maintenance (though flammable) synthetic fabrics; it is also made from the same material (polyethylene terephthalate, or PET) as many soda bottles and food containers. In fact, recycled PET plastics can provide source material for polyester fibers.

It is easy to throw caution to the wind when the office is paying for supplies, business travel...