Experts in probability theory, cosmology, quantum gravity, and computer science discuss the deep meaning of probability. They explore refining data, assessing theories, and probing ultimate reality in cosmology. Topics include confidence in precise measurements, assessing competing models, and revealing how quantum fluctuations became galactic structures.

Cosmologist and theoretical physicist Licia Verde and two others discuss major breakthroughs in cosmology and astroparticle physics over the past two decades. They also talk about the retrospective and upcoming 20th-anniversary special issue of the Journal of Cosmology and Astroparticle Physics, as well as the process of submitting papers and the partnership between JCAP, Sisa Medielab, and IOP.