P-waves (Primary waves) are compressional waves that travel fastest through the Earth and arrive first at seismic stations.

Bamboo is a giant woody grass in the Poaceae family and is one of the fastest-growing plants in the world.

Due to the Great Circle effect, the shortest path between northern cities curves upward over the polar regions, not a straight line across the Atlantic.

On a spherical Earth, the shortest distance between two points is an arc of a Great Circle, even though it looks curved on a Mercator projection.

The Amur Line, following the Amur River, forms much of the border between Russia and China in the Far East. Established through treaties like the 1858 Treaty of Aigun, it has been a historically contested boundary, with the river serving as a natural divider.

The Administrative Boundary Line (ABL) separates Ukraine-controlled territory from Russian-annexed Crimea since 2014. It is a de facto boundary, heavily militarized and disputed, as Ukraine and most nations do not recognize Russia’s annexation.

The Antarctic Treaty establishes Antarctica as a region for peaceful scientific purposes, explicitly banning military activity, weapon testing, and mineral mining.

P-waves, or Primary waves, are longitudinal compression waves. They travel faster than other seismic waves and can move through solids, liquids, and gases.

China has the greatest elevation span, ranging from Mount Everest (8,848m) to the Ayding Lake (-154m), a difference of over 9,000 meters.

Angel Falls has the greatest single uninterrupted vertical drop of 807 meters.