By comparing a subset of the photons that Alice sends with what Bob measures, the pair can check for the presence of errors introduced by Eve.

ECONOMIST: Secure cryptography is only as safe as its weakest link

One study showed that about 70% of credit reports have errors in them so check to see if there are any in yours that could be hurting your credit score and if so, be sure to have them corrected.

FORBES: 7 Steps to Buying a Home You Can Actually Afford

The exams watchdog Ofqual has ordered exams bodies to double check their papers after a series of errors by three other boards.

BBC: exam pic generic

The CFPB recommends that consumers check their credit reports for accuracy and dispute any errors that could drag their score down.

FORBES: Credit Scores Often Unreliable, Warns Consumer Financial Protection Bureau

If you take a few moments to slow down and check your work, you can prevent a lot of these errors.

FORBES: Eight Common Tax Filing Errors And How To Prevent Them

Wall Street powerhouse Bear Stearns recently received a 100, 000-line chunk of fresh software from its Bangalore development team, a block too big to check easily or to spot a single programmer's habitual errors.

FORBES: Technology