The short answer is, it's a chemical used in the plastics industry to make clear plastic that's rock hard and virtually unbreakable. So unbreakable in fact, that many manufacturers based their "unbreakable" warranties solely on the benefits using Bisphenol A provided them.
How effective is BPA at being unbreakable?
This exact same substance is used in bullet proof glass, eye glass lenses, compact disks and medical equipment.
Other resources that may explain BPA in more detail.
Wikipedia Article On BPA
Canadian Govt Page on BPA
Scientific American Article on BPA
Chemical Industry's Page on BPA
Environmental Defense on BPA
CBC's Page on BPA
Canadian Cancer Society's BPA Page
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