Even Pressure Distribution Is Key to Flight Aerodynamics.

Sound travels at approximately 343 m/s in air at 20°C, but reaches about 1,484 m/s in seawater — over 4 times faster. Water's greater density and incompressibility allow molecules to transfer vibrations more efficiently. This is why humpback whales can communicate over thousands of kilometers through the ocean.

The Three Gorges Dam on the Yangtze River is the world's largest hydropower facility by installed capacity, generating up to 22,500 megawatts. Completed in 2003 with full capacity reached by 2012, it required the relocation of over 1.3 million people. The dam provides flood control, navigation improvements, and roughly 1.7% of China's total electricity supply.

On March 1, 1896, French physicist Henri Becquerel accidentally discovered radioactivity while studying phosphorescence. He found that uranium salts emitted rays capable of exposing photographic plates without any light source — entirely on their own. This discovery overturned established views of matter and energy, and later earned him a share of the 1903 Nobel Prize in Physics alongside Marie and Pierre Curie.

Eritrea boasts a narrow-gauge railway system, built by the Italians, that remarkably ascends from sea level to over 2,400 meters. This engineering marvel, featuring numerous bridges and tunnels, still uses steam locomotives on some routes, offering a nostalgic journey through breathtaking landscapes.