A concept in Chinese philosophy describing dualistic opposite forces that are complementary....
A national park in California celebrated for its waterfalls, giant sequoias, and granite cliffs....
The first national park in the United States, known for geysers and diverse wildlife....
Soviet cosmonaut who became the first human to journey into outer space in 1961....
A mechanical property measuring the stiffness of a solid material....
A country in western Asia at the southern tip of the Arabian Peninsula....
The world's largest video-sharing platform, launched in 2005 and acquired by Google....
A physical, mental, and spiritual practice originating in ancient India....
The sex-determining chromosome in males of most mammals....
A viral hemorrhagic disease spread by infected mosquitoes, common in Africa and South America....