Why all 3D glasses should be like Sharp's  Sharp last night
unveiled its 3D Aquos Quattron HDTVs, each of which comes with
not one but two pairs of 3D glasses. But these are not ordinary
3D glasses. If you double-tap the power button, you can watch a
3D program in 2D. And that's a great idea. Here's why.  Say
you're watching the Super Bowl in 3D with a group of 3D-glasses-
wearing guys and, after one too many brewskies, your brain
begins to do an imitation of Michael Phelps. Instead of asking
your host to switch the game to 2D to the bitching and moaning
of your fellow football inebriates, you can switch your glasses
to 2D mode with none the other 3D watchers wiser.  And it works,
except for a bit of occasional ghosting. It's a solution that's
preferable to pissing off your peeps by asking the 3D be turned
off for everyone. For this 2D benefit to work, you'll need
different glasses, which are pricey ($200) and run on button-
cell batteries. Unfortunately that means they're not
rechargeable even though they're e