>>> finally tonight it's been said no act of kindness, however small, is ever wasted. with that in mind we offer the following story from a school in terre haute , indiana, where they have set out as a project to document all the ways people can make someone else 's life better with just a little bit of effort. and so nbc's kevin tibbles has tonight's making a difference report.

>> thank you. today, a spprak attack. special people performing random acts of kindness . it's catching on.

>> doing something that doesn't cost anything but makes them feel good, mak you feel good.

>> reporter: it's simple. each time someone sends kindness your way, jot it down and post it. the walls of local schools now blossom with hundreds of tiny, multi-colored thank yous, all penned by kids like those in mrs. smooty's first grade class.

>> so miss moody kept sharpening my pencil for about six times! we laughed every single time.

>> reporter: what did you write on the post-it note?

>> my friend chris helped me feel better when i wassad.

>> hunter was tying my shoe when we were going to p.e.

>> reporter: hunter is renowned for his shoe tying skills.

>> do you feel good helping other kids out?

>> really happy and excited.

>> reporter: in times filled with stress, trauma and worry, a simple gesture goes a long way. there is no yardstick for an act of kindness, is there?

>> exactly. sometimes the smallest means the most at the right time for that person.

>> reporter: even high school kids are devoted spprakers.

>> it gives me the power to change someone's life through something as small as writing on a post-it note.

>> we live in a world where all we see is darkness and hate. i feel like the spprak wall shows that's not true.

>> reporter: back in elementary school our friend martin who says he's six 1/2 plus a quarter years old, sums it up wisely.

>> it is good, mostly for bad people to learn good instead of doing bad because bad stuff could just hurt other people's feelings.

>> reporter: i couldn't have said it any better myself. kevin tibbles, nbc news, terre haute , indiana.