Scientists think they may have solved an old question about the cracking of knuckles: Why does it make that sound? The crack apparently comes from a bubble forming in the fluid within the joint when ...

While winters can be notoriously tough on hands, summer isn't exactly gentle either. Between sun exposure, hand sanitizer, and icy office A/C, skin takes a hit — especially on hardworking hands.

Many believe cracking knuckles weakens grip. However, scientific studies show this habit does not reduce grip strength. Research also indicates no strong link to arthritis. A doctor even cracked one ...