But the threat of taking over a plane with a small, sharp instrument is zero.

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"The air marshals and the flight attendants have legitimate concerns, certainly, for their own safety, but the threat of taking over a plane with a small, sharp instrument is zero, " Hawley said.

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It was a trauma in the jaw bone of one of the skulls which could have only been made with a sharp instrument and led to the first conclusion that the victims did not die naturally.

BBC: Ryedale Windy Pits skeletons were 'sacrificial'

Prosecutors did not pursue the death penalty, so Gerhartsreiter could face a maximum sentence of 25 years to life in prison for the murder conviction, plus two additional years because the jury also found that he personally used a blunt object and a sharp instrument as weapons.

WSJ: Charades are over for Rockefeller Impostor

Halvorson is known for her distinct sound on the instrument, some of which derives from her sharp strumming technique.

NPR: Mary Halvorson: Unorthodox, Jagged Jazz Guitar

Digital overload is swamping the current recommendation engines, making the sharp knife of human editorial a better filter than the blunt instrument of algorithmic recommendation.

FORBES: Humans Vs. Robots: Who's On Top?