The patent points out that networked portable devices which employ infra-red or radio-frequency communication have limitations.

ECONOMIST: The human body as a computer bus

He said two main limitations have held SDR back: the speed at which analogue-to-digital converters turn radio waves into numbers, and computer power.

BBC: SDR can read and understand different kinds of radio waves

For decades, physicists at CERN and elsewhere have been trying to overcome these limitations with antihydrogen, which consists of a single positron orbiting a single antiproton.

ECONOMIST: Antimatter: Gotcha! | The

Prosecutors have investigated 40 other cases, most of which were past the statute of limitations.

WSJ: A Brush With Justice Turns Sect Inward

The difficulties encountered in attempting to re-examine and challenge clearly erroneous verdicts have been compounded in recent decades by limitations in the ease with which post-conviction legal review is available.

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There are limitations to this, and you'll have to figure out which of your favorite blogs and news sites work well, and which don't.

ENGADGET: How-to: One-click audio news, synced with your iPod in Tiger

Now we have several categories of interest that are deductible subject to various limitations and personal interest which is not deductible at all.

FORBES: Would Be Developer Tripped Up By Interest Tracing Rules

As computer circuits shrink toward atomic dimensions - which they have for decades in accordance with Moore's Law - chip designers are running into physical limitations using traditional techniques.

ENGADGET: Extreme closeup! IBM makes 'world's smallest movie' using atoms (video)

Tax returns have a statute of limitations meaning that there is a limit to the amount of time over which the accuracy of those returns can be challenged.

FORBES: Raising Money From the (Corporate) Dead