Is cracking your knuckles bad?
For years there has been disagreement among scientists about what actually causes knuckle cracking.
Now, researchers say the familiar sound is caused by the popping of a small bubble of gas in the fingers, and have been able to see what is happening inside the joint.
Greg Kawchuk is professor of rehabilitation medicine at the University of Alberta and lead author of the research and says the research could help improve joint health care and the design of new materials.
Duration:
This clip is from
More clips from 16/04/2015
-
Peterborough: The pressure for primary school places
Duration: 04:30
-
Why did 'Cheryl's birthday' puzzle go viral?
Duration: 05:17
-
Can you solve this puzzle?
Duration: 00:44
More clips from Today
-
Could a low-calorie diet could increase the risk of depression?
Duration: 06:10
-
Jailed activist's mother 'prepared' to die
Duration: 08:30
-
PM: To deter conflict you must prepare for war
Duration: 21:33
-
Can instinct tell you if your child is unwell?
Duration: 03:16