found this article in my inbox to blog about and am finally getting to it. It is entirely relevant though since it's still summer :D
"Broccoli may outperform sunblock
The Washington Post
WASHINGTON — George H.W. Bush: Call your dermatologist.
New research suggests broccoli, the vegetable that the former president famously demonized as inedible, can prevent the damage from ultraviolet light that often leads to skin cancer. And as Bush would surely appreciate, he would not even have to eat it.
In tests on people and hairless mice, a green smear of broccoli-sprout extract blocked the potentially cancer-causing damage usually inflicted by sunlight and showed potential advantages over sunscreens.
The product is still in early stages of development. Among other issues to be worked out is how best to remove the extract's green pigments, which do not contribute to its protective effects and would give users a temporary Martian complexion.
But scientists said the research represents a significant advance because the extract works not by screening out the sun's rays — which has the downside of blocking sun-induced vitamin D production — but by turning on the body's natural cancer-fighting machinery. Once stimulated, those mechanisms work for days, long after the extract is washed away."