In the first 24 hours after a tissue injury, keep the injury site cool/cold. After 24 hours, put on warmth for 30 minutes and then cool for 15. The initial cold will control swelling and the hot-then-cold will increase the circulaiton through the injury site to promote recovery. – Waldo Weyeris
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.