Trilobites: Why Do Cracking Knuckles Make That Sound? You Might Need a Calculator Researchers developed a mathematical model to test competing theories for what causes the popping sound that will either irritate you or signal relief. Share: Facebook Twitter Google+ Stumble Digg Email ThisBlogThis!Share to XShare to Facebook Related Posts:To Calm Nervous Families, Pakistan Changes Polio Vaccination TacticsWater FOUND on Mars: NASA discovers ancient polar ice cap remnants on Red PlanetNASA climate SHOCK: Scientist flies 60,000ft VERTICAL to edge of atmosphere – left STUNNEDLatest Arena for China’s Growing Global Ambitions: The ArcticAsteroid WARNING: ‘HAZARDOUS’ rock 15 TIMES size of a football pitch to pass TOMORROWWeather WARNING: Solar minimum arrives EARLY and it could bring long EXTREME cold
