Another Dirac

Anthropic Fluctuations vs. Weak Anthropic Principle

Anthropic Reasoning in Cosmology: A Historical Perspective

Anti-positivism, theoretical sciences and relativity in the Argentina of the 1920s

Antimatter weapons (1946-1986): From Fermi and Teller's speculations to the first open scientific publications

Antisymmetric Tensor Fields, 4-Potentials and Indefinite Metrics

Arago (1810): the first experimental result against the ether

Aristotle: The first encyclopedist

Around Kepler's "Dream"

Associated Sturm-Liouville systems

Astronomical Symbolism in Australian Aboriginal Rock Art

Astronomy and astronomers in Jules Verne's novels

Astronomy and the Fall of Babylon

Astrophysical Paradoxes, long version

Asymptotic freedom: history and interpretation

At the other end of the sun's path. A new interpretation of Machu Picchu

Atomic Modeling in the Early 20th Century: 1904 - 1913

Australian Aboriginal Geomythology: Eyewitness Accounts of Cosmic Impacts?

Babylonian and Indian Astronomy: Early Connections

Bethe-Salpeter Equation -- The Origins