There's a reason why your doctor takes your blood pressure nearly every time you step into their office: It's a quick and painless way to get a snapshot of your heart health. But that doesn't mean it's the best way.That's because blood pressure can change based on a variety of factors, including pain, temperature, physical exertion and even doctor's visits.So how do you avoid these potentially false positives and false negatives? Do DIY testing. If you can't imagine yourself sitting at your kitchen table manually pumping up a blood pressure cuff, don't worry. The newest crop of over-the-counter monitors are wireless, digital and easier than ever to use. Here's what you need to know before buying one. How do wireless blood pressure monitors work?Every time your heart beats, it pumps blood throughout your circulatory system, putting pressure on the walls of your blood vessels. Blood pressure monitors typically measure the force of this pressure in millimeters of mercury (mmHg) … [Read more...] about Why you should get a wireless blood pressure monitor
Phencyclidine false positive
A sprinter is seen on his way to win the men's 400m final. See more Olympic pictures. FRANCOIS-XAVIER MARIT/AFP/Getty Images A false start, according to the International Amateur Athletic Federation's guidelines for track events, is characterized by one of two situations: A runner leaves the starting block before the starting gun sounds.A runner reacts to the starting gun in less than one-tenth of a second. Research has found that a reaction time faster than one-tenth of a second is impossible for a human, and the runner is therefore deemed to have anticipated the gun. Under current international rules, a sprinter is allowed one false start without penalty; the second false start results in disqualification. A proposed rule change would institute a "zero-tolerance" policy that would disqualify a sprinter after the first false start. Olympics Image Gallery The most common way to detect a false start in major track meets is by a device called ReacTime. The ReacTime unit sits on … [Read more...] about In a track meet how are false starts detected?
Amazon is trying to sell its Rekognition facial recognition technology to law enforcment, but the American Civil Liberties Union doesn't think that's a very good idea. And today, the ACLU provided some seemingly compelling evidence -- by using Amazon's own tool to compare 25,000 criminal mugshots to members of Congress. Sure enough, Amazon's tool thought 28 different members of Congress looked like people who've been arrested. Here's the full list, according to the ACLU:SenateJohnny Isakson (R-Georgia)Ed Markey (D-Massachusetts)Pat Roberts (R-Kansas)HouseSanford Bishop (D-Georgia)G. K. Butterfield (D-North Carolina)Lacy Clay (D-Missouri)Mark DeSaulnier (D-California)Adriano Espaillat (D-New York)Ruben Gallego (D-Arizona)Tom Garrett (R-Virginia)Greg Gianforte (R-Montana)Jimmy Gomez (D-California)Raúl Grijalva (D-Arizona)Luis Gutiérrez (D-Illinois)Steve Knight (R-California)Leonard Lance (R-New Jersey)John Lewis (D-Georgia)Frank LoBiondo (R-New Jersey)Dave … [Read more...] about Amazon facial recognition mistakenly confused 28 Congressmen with known criminals
Thousands of attendees of the 2017 Champions League final in Cardiff, Wales were mistakenly identified as potential criminals by facial recognition technology used by local law enforcement. According to the Guardian, the South Wales police scanned the crowd of more than 170,000 people who traveled to the nation’s capital for the soccer match between Real Madrid and Juventus. The cameras identified 2,470 people as criminals. Having that many potential lawbreakers in attendance might make sense if the event was, say, a convict convention, but seems pretty high for a soccer match. As it turned out, the cameras were a little overly-aggressive in trying to spot some bad guys. Of the potential criminals identified, 2,297 were wrongly labeled by the facial recognition software. That’s a 92 percent false positive rate. Wired obtained additional data regarding the Wales system and found it’s been consistently bad. At a boxing match last year, the cameras produced a 90 percent … [Read more...] about Facial Recognition Used by Wales Police Has 90 Percent False Positive Rate
The implements for a screening test for colon cancer are displayed. Many cancer screening tests have high rates of false positives. Media for Medical/UIG via Getty Images You can't believe this is happening. In a proactive health move, you undergo a CA-125 test, which screens for ovarian cancer. The test result comes in positive. Shocked and reeling, you spend an agonizing week waiting for the results of a subsequent surgical procedure. When the results are in, they're negative. You don't have ovarian cancer after all. The first result was a false positive. You're elated, yes, but also angry. What's the use of having a screening test if it might not be accurate? When it comes to your health, the more informed you are, the better. Medical tests can produce one of four results: True positive. The test says you have condition "X," and you really do.True negative. The test says you do not have condition "X," and you really don't.False positive. The test say you have condition "X," … [Read more...] about How False Positives Work (and What They Could Mean for Your Health)