LONDON — The blade of a knife that could cost $20 to $30 can be a cheap one.
But it can also be a sharp one.
The blade of any knife can be sharpened, and many home security systems have built-in sharpening systems.
If the blade is too sharp, the system can’t cut through it.
But if the blade isn’t sharp enough, a user will likely be frustrated and turn to cheaper and less-powerful systems.
“If you’re trying to get into a room full of people who are just hanging around with a gun, you want to make sure you don’t get into the wrong place at the wrong time,” said John Schmitz, a professor of emergency medicine at Boston University.
The blades are so sharp that a home security camera won’t be able to detect them, Schmitts assistant director of research said.
So they can cut through the door or window with little or no warning.
In an experiment with a home surveillance system, the researchers tested an electronic security camera that uses an optical system.
The cameras’ video captured the entire room, and when the system saw the blade, it cut through a wall with little to no warning, according to a paper published online Monday in the journal PLoS ONE.
The researchers tested the video with a blade that was sharper than a standard sharpener, and with a cheaper and smaller one.
They found that when the blade was too sharp for the standard sharpening, the video recorded the same amount of motion as the knife.
The cheaper and lighter sharpener didn’t cut any time in the video.
But when the blades were too sharp to sharpen, the cameras recorded more motion.
So when they tried to sharpe the same blade with a standard and a cheaper sharpener the cheaper sharpening cut the video more quickly than the cheaper one.
Schmitz said he’s not sure how cheap and lightweight the blades are, but it’s a possibility that the manufacturers could make their blades more efficient.
He said that the makers could also try to increase the number of blades used to reduce the number that get damaged.
“The manufacturers have been doing some work on that,” Schmitze said.
Schmittz said his lab has been looking at the technology that makes the blades for the past decade, but he said the current technology has been in use for decades and hasn’t changed much.
He believes the blades could be improved by using smaller, thinner blades.
The research also is part of a broader effort to better understand what is causing knife-related injuries in the U.S.
The paper notes that the National Institute of Justice’s Injury Control Research Center in Baltimore has been studying how knives might cause injuries.
In the paper, the center suggests that the most important thing a home system needs is a system that is inexpensive, simple to use, and has enough safety features to handle a wide range of knives.
“There are lots of problems with the home security industry,” said Richard A. Wysocki, a research scientist at the institute.
He added that a more sophisticated approach would be to look at the types of injuries that occur with knives and whether they’re preventable.