\nThey found that the shared digs caused the microbiomes of the young mice to more closely resemble that of the older animals. When they compared the abilities of the mice to recognize a novel object, or to find the exit in a maze, the young mice with “old” microbiomes performed significantly more poorly than their peers — showing less curiosity about the unfamiliar object and bumbling about the maze in ways similar to that of old animals.
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The BEA calculates the outdoor recreation economy in broad terms, including everything from the economic output generated by renting a mountain bike for a day to the impact of an outdoor concert. But access to America’s great outdoors is an economic powerhouse in its own right. In 2024, national parks alone accounted for $56.3 billion in output, 340,000 jobs, and $29 billion in receipts for local gateway regions, according to the National Park Service. Last year, outdoor recreation on public lands and waters added an average $351 million to the economy every day, according to the Outdoor Recreation Roundtable, an industry group.