I think my biggest struggle with parenting DS is when is he 5 and when is he not. He's not 5 more than he is, your using work ethic reminds me of that, it's appropriate to talk about with an older kid but maybe not so much for 5!!
DeHe
I think the seeds of work ethic are planted at age 5, and I do think that all that awful coloring benefits the development of 5 year olds.
If he loves science then perhaps to get him a microscope and ask him to keep a log of his observations, or show him John James Audubon's Birds of Americaweb4.audubon.org/bird/BoA/BOA
Colored pencils or cray pas might work more to his satisfaction in his hands, there is something physically unpleasant to the vibration in the hand from coloring.
google images for 'hematopoietic cells' and you might have the makings of a coloring book. If you print out in greyscale and let him use colored pencils he might really enjoy himself.
Asynchronous development really calls for extra brainstorming.
Smiles,
Grinity
