This restriction has been established to avoid the possibility of an accidental pointing error causing too much light to fall upon an instrument.

BBC: Close up on Mercury

Thanks to reader Doug Berman for pointing out the error, which has been corrected.

FORBES: Goldman Sachs Reworks $5B In Warrants Held By Buffett's Berkshire

Many thanks to Mike Cowan (author of the Cowan LRA Forecasting Model) for pointing out an error in a prior version of this post, and for providing the numbers behind the chart.

FORBES: SIA Announces January Semiconductor Sales, Down 8.8%

She was impatient when pointing out the error.

FORBES: 3 Steps To Cure Job Stress In Time For Your Next Coffee Break

This has caused some to speculate that the company is making a costly tactical error, pointing to disappointing sales of the Surface.

BBC: Interview: The man behind the PowerPoint presentations