"Powered by Condensation Nuclei"
Sure, it's a bit geeky - making a design about the particles that water condenses around to form clouds. It may confuse some people, but you'll get a good laugh from those who 'get it'.

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Condensation Nuclei Jr. Raglan Powered By Condensation Nuclei (you know, the particles around which water condenses and thereby forms clouds!) A bit geeky sure, but so what. (poweredbytshirts.com) $22.99 Size:  Size Chart Small Medium Large X-Large Color: Black/White Pink/White Baby Blue/White Qty:    AVAILABILITY: Product Number: 29869932 Tell a friend about this product! Product Information Fit: Form Fitting Body-hugging close contoured fit. Size up for a looser fit. Fabric Thickness: Our Jr. Raglan from American Apparel is body contoured and baby soft. Made of 100% superfine combed cotton baby rib, this raglan provides the perfect look for any season. 5.8 oz. 100% Ultra-fine combed ring spun 1x1 baby rib cotton Size up for a looser fit Made in the U.S.A.