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Scientists remind people repeatedly - DO NOT FEED BEARS. Why is this so important? Bears that are fed become comfortable being around humans, and are more likely to damage property or injure someone. Humans can help protect bears simply by remembering not to feed them.

The Grand Canyon Skywalk is a U-shaped bridge that extends over the edge of the canyon and towers over the Colorado River 800 feet below. The skywalk is made of a very thick glass floor and sides, making it transparent. It was designed to withstand strong winds.

In the 1990's, McDonalds started getting bad publicity for the amount of fat in their kids' meals. At that time, one hamburger Happy Meal contained about 70% of the recommended daily fat allowance for children. Greasy French fries account for most of the fat in the meal. McDonalds solved the problem by offering healthy apples in place of the greasy fries.

Smokey Bear is a fictional character that has educated generations of Americans about how they can help prevent human-caused wildfires. He was created in 1944 and his original catch phrase was "Smokey says - Care will Prevent 9 out of 10 Forest Fires." In 1947, the phrase was shortened to "only You can prevent Forest Fires." It was changed once again in 2001 to "Only You can prevent Wildfires!" Smokey Bear's message is still as important today as ever.

Glaciers and avalanches are both made of frozen material. They can both occur in cold, mountainous areas. There are some major differences between glaciers and avalanches, however. Glaciers are large masses of ice and snow that move very slowly, while avalanches occur suddenly when a large mass of snow falls off a mountainside and tumbles to the ground. Glaciers can last for thousands of years, whereas avalanches occur and are over in a very short period of time.