But as yet there is no smoking gun - a protein involved in regulating brain function, say - that may have caused our ape-like ancestors to branch off from chimps.
In a heated back and forth, the two debated whether it was truly harmful to force everyone who wants to purchase a gun -- whether at a gun store, a gun show, or in a private sale -- to go through a background check.
At 12:00 BST on Monday, a 41-gun salute will be fired from Hyde Park, along with a 21-gun salute in Windsor Great Park and a 62-gun salute at the Tower of London.
Apparently in a study done by the Deafness Research UK in conjunction with Dr. Brad Backus of University College London, 14 out of 15 toys tested produced noise levels above the recommended safety limit when held close to the ear. 8 of the 15 were just fine during normal use, but the three worst offenders -- a machine gun, a tommy gun and a cap gun -- are on the "avoid" list.
President Barack Obama is rolling out the red carpet, complete with the full pomp of a 21-gun salute and a black-tie dinner after Oval Office talks on Wednesday.
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Because in the two months since Newtown, more than a thousand birthdays, graduations, anniversaries have been stolen from our lives by a bullet from a gun - more than a thousand.
"What makes the difference ... is the willingness of the legislators and the governors to take the lead and also, you know, the experience of gun violence in that state, whether it be through a mass shooting or the day-to-day shootings, " said Lindsay Nichols, staff attorney for the Law Center to Prevent Gun Violence, a gun-control advocacy group based in San Francisco.
Kennedy International Airport while carrying a stun-gun on Wednesday, a law-enforcement official said.
Because in the two months since Newtown, more than a thousand birthdays, graduations, anniversaries have been stolen from our lives by a bullet from a gun -- more than a thousand.
Perhaps the efforts of the anti-gun violence organization founded by Giffords -- a decidedly compelling advocate for gun control -- may sustain the media's attention.
Mr Obama also signed 23 unilateral orders, including an end to a ban on gun-violence research by a prominent federal agency, and a measure promoting responsible gun ownership.
Collins was attacked at gunpoint at a University of Nevada-Reno parking garage in a gun-free zone located 50 feet away from the campus police department office in October 2007.
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She acknowledged that other provisions of a gun-control package might have a better chance of passing without the controversial assault weapons ban.
So if you have one element that says strength - like a gun - but everything else doesn't follow that, that's not the narrative you think you have.
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Paul Helmke, president of the Brady Campaign to Prevent Gun Violence, a gun-control group, said lawmakers should consider expanding the definition of mental illness when it comes to barring individuals from buying guns, and possibly require purchasers to submit references.
The vast majority of Americans -- including a majority of gun owners -- support requiring criminal background checks for anyone trying to buy a gun. (Applause.) So right now, Democrats and Republicans in the Senate are working on a bill that would ban anyone from selling a gun to somebody legally prohibited from owning one.
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According to police, on December 15 -- a day after the Sandy Hook shooting -- a man was arrested at Riverview Gun Sales for stealing a .50-caliber firearm.
But prosecutors presented evidence they said showed Mr George was a celebrity and gun-obsessed stalker with a grudge against the BBC, where he had worked as a messenger for a short time in the past.
Brian Vincent, a former schoolteacher who owns a gun shop in the centre of Gretna and teaches a gun-safety class, says the argument that guns are patently unsafe will not stand up in court.
He had fled from officers into a dead-end street, where police found him apparently with a gun-shot wound in the head.
In Illinois, the mayor's money bought four television ads and seven pieces of direct mail that helped ex-legislator Robin Kelly, a gun-control advocate, come from behind.
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He dreamed of footsteps crunching on the driveway gravel, of shadows in the pre-dawn darkness, of a gun-toting police squad bursting through his backdoor at 5 am.
However, acquiring a gun is not an easy process -steps to gun ownership include a medical examination and a written test.
In the first incident on Friday evening, two men - one of whom was carrying a gun - stole money and cigarettes from an RS McColl's newsagents in Clarkston.
If you're a hunter, if you're a sportsman -- if you have a gun in your house for protection -- you've got to understand what it feels like for that mom whose son was randomly shot.
On his Facebook page, he took on the National Rifle Association -- the central pro-gun rights lobby -- after a news conference by a top NRA official about the Newtown tragedy triggered widespread anger.
Previous attempts to pass a gun-control law have failed, so the government has put a clause in its bill promising that the restrictions on gun sales would only come into effect if approved by a national referendum.
In short, it seems President Obama has been engaged in gun-walking on a massive scale.
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Ward was already on parole for a previous gun violation -- unlawful use of a firearm -- when he shot Pendleton, McCarthy said.
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