Three convicted murderers inhabit Colorado's death row, a state that has carried out a single execution in the past 45 years.

CNN: Why death penalty for Holmes wouldn't bring justice

While FINRA has historically played a key role in combating insider trading, the SEC recently unveiled plans to develop a centralized database that would store information on every single trade order, execution, and cancellation across across numerous equity and options trading markets.

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It also took on a growing number of blasphemy cases filed against Ahmadis, a heterodox Muslim sect, and Christians: a single accusation could result in execution.

NEWYORKER: Days of Rage

It was in 1934 that perhaps the single worst act of torture and execution in 20th-century America happened.

CNN: Trayvon's killing and Florida's tragic past

In his interview with the Daily Telegraph, Mr Delors says the debt crisis stems not from the idea of a single currency itself, but from "a fault in execution" by political leaders who oversaw its launch.

BBC: Jacques Delors: Euro was flawed from beginning

Execution No 135, of Gary Graham, was done on the startlingly flimsy evidence of a single witness.

ECONOMIST: Election Briefing: Death penalty

Given that the company measures the number and implementation rate of ideas, managers can convert a single initiative into many distinct efforts, and they may make their concepts less controversial to maximize the odds of their execution.

FORBES: How to Keep Big Ideas Big