James Clerk Maxwell formulated the classical field equations that unify electricity, magnetism, and light as electromagnetic waves.

Lead's chemical symbol is Pb, from its Latin name 'plumbum,' reflecting historic use in pipes and construction.

The Rio Grande (Río Bravo) forms a long stretch of the US–Mexico border, serving as a geographic and political boundary.

The Library of Alexandria was founded in the 3rd century BCE under the Ptolemaic dynasty in Egypt, becoming a hub of ancient learning.

Marie Curie, with Pierre, discovered radium and polonium in 1898, pioneering radioactivity research and earning two Nobel Prizes.