A child will double his or her weight in 6 months, triple it by 1 year, and between 3 years and 12 years will gain each year the same number of pounds as they are years old (e.g., a 4 year-old gains 4 pounds that year).
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.