All else being equal, bone density will be directly proportional to loading — so if you want dense bones (and really, who doesn’t?) then either get fat and walk a lot or lift heavy weights. — Sarah, software developer
A cool tool is anything useful that is superior to comparable items. If you think this tool is inferior suggest a better one. You are welcome to insult a tool, but comments containing insults to individual people will be deleted. Corrections of fact are always welcomed, if stated politely. Recommendations of better tools are dearly wanted and may be elevated to the front page.