Mix grass seed in with potting soil. Fill up a nylon. Tie into segments with string to make a 'caterpillar." Soak in water till saturated. Then let the kids spray it with water every day after and watch it grow. When the grass gets "too long" let the kids give it a "haircut."
Get inspired to introduce anatomy to your kids with Aimee’s amazing DIY anatomy lesson for the respiratory system. Read the full instructions on how to make paper bag lungs and read more about Aimee’s experience with Know Yourself at A Mom’s Take.