This poster is an ad campaign in Basel to get people to use sunscreen. It's also a lesson German modal verbs:

"I know how little I should."

"I know how much I can."

"I know how much I may."

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By the way, I noticed that people generally say "sunscreen" these days, rather than "suntan lotion," as people said when I was growing up in the 70s. A sign that the reason to use the stuff has changed ...