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?
Quantiferon false positive rate
"Brainwashing" is one of many psychology terms we misuse regularly. Stephan Zabel/Getty Images The journal Frontiers in Psychology has published an article listing 50 psychological and psychiatric terms that are "inaccurate, misleading, misused, ambiguous and logically confused." Many of those terms are ones we see all the time in publications or hear on TV. You might have used them yourself. Here are eight from the list, with explanations from the authors as to why they're problematic. 1. Antidepressant Medication Medications such as selective serotonin reuptake inhibitors (Prozac, Zoloft) and tricyclics (Norpramin) are often called antidepressants. But there's little evidence that these are more effective for treating mood disorders than for other conditions like bulimia nervosa or panic disorder. "Hence, their specificity to depression is doubtful, and their name derives more from historical precedence—the initial evidence for their efficacy … [Read more...] about We Can All Stop Misusing These Psychological Terms
False aralia's leaflets are thin and have toothed edges. See more pictures of house plants. False aralia is also called threadleaf and finger aralia. This house plant is actually a small tree, which is quite easy to grow indoors. The false aralia is a small tree producing thin, coppery red to deep green leaflets with toothed edges. They are joined in a finger-like pattern. It can grow to be six or more feet in height. When it reaches this height, its leaves change to their broader, less attractive adult form. The plant does best in bright light, but many people prefer the way it looks in lower light when it sheds much of its foliage, giving it an airy appearance. False Aralia Quick Facts Scientific Name: Dizygotheca elegantissima Common Names: False Aralia, Threadleaf Aralia, Finger Aralia Light Requirement for False Aralia: Bright Light to Light Shade Water Requirement for False Aralia: Drench, Let Dry Humidity for False Aralia: High Temperature for False Aralia: House Fertilizer … [Read more...] about False Aralia
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)