Researchers have studied criminal behavior and genetics for more than a century, and the findings are sometimes controversial.
Stephen Paddock tried to make the purchase at a gun show in Phoenix weeks before the attack.
Wayne LaPierre said Hollywood was teaching gun irresponsibility to the American public.
Despite doubts from authorities, ISIS is insisting that Stephen Paddock was acting as a "soldier of the caliphate" when he murdered 58 people in Las Vegas.
Hundreds of thousands of people flock to Lollapalooza each year, including the elder daughter of former President Obama in August.
The gunman saw the guard approaching, so stepped out of his room and shot him in the leg.
At least six online stores have sold out of the conversion device amid calls for its ban.
Lance Bass would like to donate blood to help Vegas victims, but he can't.
The "person of interest" in the investigation has flown back to the U.S. to be interviewed by federal agents.
The group said that Stephen Paddock was one of its "soldiers" after the mass shooting.
Clark County Sheriff Joe Lombardo said that the police could not be everywhere.
The president will meet with the friends and family of the victims, offering his support to those recovering from their wounds, and thanking first responders.
"Stop giving fame-seeking mass shooters the personal attention they want,” they say.
One camera was found on a room service cart in the hallway.
This latest conspiracy theory is being pushed, again, by the likes of Alex Jones and Yournewswire.com.
Stephen Paddock used two “bump-stocks” to carry out the worst mass shooting in U.S. history, officials said.
The GoFundMe page passed its initial target of $500,000 within hours of going live.