"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 Baseball Jersey 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) $21.99 Size:  Size Chart Small Medium Large X-Large 2X-Large (+$3.00) Color: Black/White Red/White Blue/White Qty:    AVAILABILITY: Product Number: 29869934 Tell a friend about this product! Product Information Fit: Standard Not too tight, not too loose. Fabric Thickness: Our 100% cotton Baseball Jersey is a sporty hit with both men and women whether you're in the game or just looking the part in great run-around casual-wear. Choose red, blue or black sleeves. 6.1 oz. 100% heavyweight cotton Standard fit 3/4 length contrasting raglan sleeves