You probably remember the joy of drawing with chalk on a sunny day, letting your imagination run wild as you colored the pavement. But chalk isn't just for kids anymore! This versatile little stick of ...

Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. If you’ve ever seen ...

Add Yahoo as a preferred source to see more of our stories on Google. Back in the day, we used chalk to draw on the sidewalk or do math in the classroom. And while schools have moved past blackboards, ...