School may be back in session, but that doesn't mean your kids are excited about it. Remind them how fun learning can be with free downloadable STEM activities brought to you by Let's Talk Science. Help kids brush up on their computing and problem-solving skills with a digital literacy activity, then jump into climate science and learn how water moves up a plant with celery or, for older kids, the best way to clean up an oil spill. These activities are appropriate for kids in kindergarten through grade eight.