Pistachio nuts; how to remove obstinate husks and get the shells to open?

This article from Tucson Community Supported Agriculture discusses how to roast pistachios, walking through the maturing process of the pistachio nuts. Another site issued a warning about the fresh pistachios. "...fresh pistachios where the hard shell is not open, please don’t try cracking them open with your teeth. You can cause some serious damage to your teeth."

http://www.tucsoncsa.org/2009/10/how-to-roast-pist...

ADD'L BIT...

The following except is from the Wikipedia website, and offers some interesting uses for the empty pistachio shells.

"The empty pistachio shells are useful for recycling in several ways. If unsalted, the shells need not be washed and dried before reuse, but washing is simple if that is not the case. Practical uses include as a fire starter, just as kindling would be used with crumpled paper; to line the bottom of pots containing houseplants, for drainage and retention of soil for up to two years; as a mulch for shrubs and plants that require acid soils; as a medium for orchids; and as an addition to a compost pile designed for wood items that take longer to decompose than leafy materials. Pistachio shells take up to a year to decompose unless soil is added to the mix. Shells from salted pistachios can also be placed around the base of plants to deter slugs and snails. Many craft uses for the shells include holiday tree ornaments, jewelry, mosaics, and rattles. Research indicates that pistachio shells may be helpful in cleaning up pollution created by mercury emissions."

http://en.wikipedia.org/wiki/Pistachio

Could you put a net over them to keep the birds away? Or hang twirling CDs to scare them off? Ripening might be part of the problem.

Otherwise, for walnuts, you put them in a bag and run over them a few times with your car. It might work for pistachios, too.