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2. Hydrogen production - Wikipedia

   en.wikipedia.org/wiki/Hydrogen_production

   Learn how hydrogen is produced by various industrial methods, such as steam reforming, electrolysis, and pyrolysis. Find out the differences between gray, blue, green, and other types of hydrogen based on their origin and emissions.

3. Liberia - Wikipedia

   en.wikipedia.org/wiki/Liberia

   Liberia is a West African country founded by American settlers in the 19th century. It is the first African republic to declare independence and has a long and turbulent history of civil wars, dictatorships, and human rights violations.

4. High-speed rail - Wikipedia

   en.wikipedia.org/wiki/High-speed_rail

   High-speed rail is a type of rail transport network using trains that run faster than traditional rail, with specialized rolling stock and dedicated tracks. Learn about the history, network, comparison and accidents of high-speed rail around the world.