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Archive for December, 2016

Real-Time Visualization of Joint Cavitation

December 30th, 2016 No comments

Cracking sounds emitted from human synovial joints have been attributed historically to the sudden collapse of a cavitation bubble formed as articular surfaces are separated. Unfortunately, bubble collapse as the source of joint cracking is inconsistent with many physical phenomena that define the joint cracking phenomenon. Here we present direct evidence from real-time magnetic resonance imaging that the mechanism of joint cracking is related to cavity formation rather than bubble collapse. In this study, ten metacarpophalangeal joints were studied by inserting the finger of interest into a flexible tube tightened around a length of cable used to provide long-axis traction. Before and after traction, static 3D T1-weighted magnetic resonance images were acquired. During traction, rapid cine magnetic resonance images were obtained from the joint midline at a rate of 3.2 frames per second until the cracking event occurred. As traction forces increased, real-time cine magnetic resonance imaging demonstrated rapid cavity inception at the time of joint separation and sound production after which the resulting cavity remained visible. Our results offer direct experimental evidence that joint cracking is associated with cavity inception rather than collapse of a pre-existing bubble. These observations are consistent with tribonucleation, a known process where opposing surfaces resist separation until a critical point where they then separate rapidly creating sustained gas cavities. Observed previously in vitro, this is the first in-vivo macroscopic demonstration of tribonucleation and as such, provides a new theoretical framework to investigate health outcomes associated with joint cracking.

Source: Real-Time Visualization of Joint Cavitation

Categories: Cool, Health Tags:

Fox News wonders whether we should cancel food stamps because 0.09% of spending is fraudulent – The Washington Post

December 29th, 2016 No comments

Meanwhile, the GAO outlined ways to save billions in other departments.

Source: Fox News wonders whether we should cancel food stamps because 0.09% of spending is fraudulent – The Washington Post

Categories: Economics, Politics, USA! USA! USA! Tags:

Maciej Ceglowski – Superintelligence: The Idea That Eats Smart People (Keynote) – YouTube

December 24th, 2016 No comments

Categories: Hacking, Robotics, SoftwareDev Tags:

Russian hackers tracked Ukrainian artillery units using Android implant: report | Reuters

December 23rd, 2016 1 comment
Categories: Hacking, IT Security Tags:

Don’t Blame Craigslist for the Decline of Newspapers – POLITICO Magazine

December 22nd, 2016 No comments

It’s fun to beat up on Craig Newmark for the end of classifieds, but papers were greedy, too.

Source: Don’t Blame Craigslist for the Decline of Newspapers – POLITICO Magazine

Categories: Economics Tags:

Why Darth Vader never gets paid: a lesson in Hollywood accounting

December 22nd, 2016 No comments

The true creatives in Tinseltown are the accountants who can transform a box office hit into a financial stinker.

Source: Why Darth Vader never gets paid: a lesson in Hollywood accounting

Categories: Economics Tags:

List of inventors killed by their own inventions – Wikipedia

December 21st, 2016 No comments
Categories: Cool, Funny Tags:

Special report: I spent 5 years with some of Trump’s biggest fans. Here’s what they won’t tell you.

December 21st, 2016 No comments

How Donald Trump took a narrative of unfairness and twisted it to his advantage.

Source: Special report: I spent 5 years with some of Trump’s biggest fans. Here’s what they won’t tell you.

Categories: Politics, USA! USA! USA! Tags:

Trump, Putin and the Pipelines to Nowhere – Medium

December 20th, 2016 No comments
Categories: Economics, energy, Environment, Oil, Politics Tags:

How Capitalism Changes Conscience | Culture & Conscience | Center for Humans & Nature

December 18th, 2016 No comments

Wealth generated out of capitalist systems mean people worry less about basic survival— how does this affect their view of the world?

Source: How Capitalism Changes Conscience | Culture & Conscience | Center for Humans & Nature

Categories: Economics, Politics Tags: