If you use Excel 40 hours a week (and those are the weeks you are on vacation), welcome to the MrExcel channel. Home to 2,400 free Excel tutorials. Bill "MrExcel" Jelen is the author of 67 books about ...

Doctors are warning against outdoor exercise during high pollution days, as breathing toxic air can be equivalent to smoking. Morning walks in haze expose lungs to harmful PM2.5 and PM10 particles, ...