Rider on a theme-park water slide (@ Peter Essick/Aurora Photos)

Rider on a theme-park water slide (@ Peter Essick/Aurora Photos)

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Kayakers on Eagle Creek in the Columbia River Gorge, Oregon, U.S.A. (@ Ty Milford/Aurora Photos)

Kayakers on Eagle Creek in the Columbia River Gorge, Oregon, U.S.A. (@ Ty Milford/Aurora Photos)

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Timothy grass pollen (@ Bob Sacha/Corbis)

Timothy grass pollen (@ Bob Sacha/Corbis)

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Aerial view of boats in the Tyrrhenian Sea, off the coast of Capri, Italy (@ Glowimages/Getty Images)

Aerial view of boats in the Tyrrhenian Sea, off the coast of Capri, Italy (@ Glowimages/Getty Images)

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The Goosenecks of the San Juan River, Goosenecks State Park near Mexican Hat, Utah, U.S.A. (@ Universal Images Group/SuperStock)

The Goosenecks of the San Juan River, Goosenecks State Park near Mexican Hat, Utah, U.S.A. (@ Universal Images Group/SuperStock)

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The Palm Islands artificial archipelago in Dubai, United Arab Emirates (@ Jochem Wijnands/age fotostock)

The Palm Islands artificial archipelago in Dubai, United Arab Emirates (@ Jochem Wijnands/age fotostock)

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Meerkats in Namibia (@ Gerard Lacz/age fotostock)

Meerkats in Namibia (@ Gerard Lacz/age fotostock)

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