Science is a dual-purpose endeavor. First, it involves the systematic study of the natural world to understand the fundamental laws and principles that govern physical phenomena. Second, it involves the practical application of these discovered scientific principles through engineering and technology to create tools, systems, and solutions that improve human life and expand our capabilities.

The name 'Pakistan' is derived from the Persian and Urdu languages, where 'Pak' means pure and 'stan' means land. Therefore, it is widely interpreted as the 'Land of the Pure', reflecting the vision of a nation founded on the principles of purity and faith.

Jabir ibn Hayyan, often referred to as the father of early chemistry, is credited with the discovery and synthesis of several mineral acids, most notably sulphuric acid, which he produced through the distillation of vitriols. His work laid the foundational principles for modern chemical processes.

Christiaan Huygens was a Dutch polymath who made significant contributions to physics and astronomy. In 1656, he invented the first pendulum clock, which greatly improved timekeeping accuracy. Furthermore, using an improved telescope, he discovered Saturn's largest moon, Titan, and provided the first correct explanation for the appearance of Saturn's rings, which had previously been misunderstood by other astronomers of his era.

In the late 17th century, both Isaac Newton and Gottfried Wilhelm Leibniz independently formulated the principles of calculus. Newton focused on the method of fluxions, while Leibniz developed the notation and conceptual framework for integral and differential calculus. Their work provided the essential mathematical language required to describe motion, change, and physical laws, effectively laying the groundwork for the development of classical mechanics and modern physics.

Archimedes of Syracuse was a brilliant Greek mathematician, physicist, and engineer. He is most famous for discovering the principle of buoyancy, often called Archimedes' principle, which states that any object, wholly or partially immersed in a fluid, is buoyed up by a force equal to the weight of the fluid displaced by the object. This discovery was a foundational contribution to the field of hydrostatics and remains a core concept in physics.

The Tehran Conference, held in late 1943, was a pivotal meeting between the 'Big Three' Allied leaders. During this summit, they discussed the post-war international order and reached an agreement in principle to establish the United Nations as a successor to the League of Nations to maintain global peace and security. This meeting laid the groundwork for the subsequent conferences that finalized the UN Charter.

Appeasement is a diplomatic policy of making political, material, or territorial concessions to an aggressive power in order to avoid conflict. It is most famously associated with the British and French foreign policy toward Nazi Germany in the 1930s.

The Beloye-More Canal, also known as the White Sea–Baltic Canal, is a significant engineering project in Russia. It is frequently cited in various records as one of the longest shipping canals in the world due to its extensive length connecting the White Sea to the Baltic Sea.

The Panama Canal is a lock-based canal, meaning it uses a series of massive water-filled chambers to lift ships up to the level of Gatun Lake and lower them back down to sea level. In contrast, the Suez Canal is a sea-level waterway that does not require locks.