And sometimes that impact is just planting a seed. Seeds take time to grow, and the ripples of our actions aren't always seen quite so clearly the further away from them we get.
And sometimes your impact is helping the person who will one day create the theory behind light speed travel get into a good college, or just encourage them to keep trying.
Your name doesn't have to be in a book or on a plaque for your life to have mattered, Ray.