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The authors of one study conclude, "We still do not know which factors encourage individuals to engage in deliberate practice. "

Regardless of what you may think of him, there is no reason to suspect him of bringing about this horrible accident deliberately.

But one of the biggest fears around the Olympics is not a crashed server or power outage, but a deliberate attack by cyber criminals.

A small plane has crashed into a building in Austin in the US state of Texas, and officials are investigating whether it was deliberate.

And if a man come presumptuously upon his neighbor, to slay him with guile; thou shalt take him from mine altar, that he may die.

He suspected that members of his staff were purposely trying to undermine the project and prohibited them from access to some of the work.

If it were engineered by intentionally putting sulphate into the stratosphere they would judge it to be deliberate.

Her words carried the ring of deliberate provocation, challenging the Islamists to put a fatwa on her and raise a sword to behead her.

However, the former defender of Parma was quick to point out that this was just an invented story to further stir up the environment.