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From the Antonine Plague and the Black Death to the 1918 influenza and HIV, trace how infectious disease has repeatedly redirected the course of history — altering trade routes, collapsing governments, reshaping religious belief, and driving medical revolutions. This course goes beyond biology to examine the social, political, and economic aftershocks of humanity's longest-running adversary.

Understand why concert halls, recording studios, open-plan offices, and cathedrals sound the way they do — covering reflection, absorption, diffusion, reverberation time, and the materials and shapes that shape a room's acoustic character. A fascinating intersection of physics, architecture, and perception that changes how you hear every space you enter.

Learn how to plan a multi-day paddling trip from scratch — reading topographic and river maps, packing waterproof kit, understanding river hydraulics and lake weather, and campsite selection. This text-and-diagram course covers the decisions that separate a safe, enjoyable journey from a preventable disaster.

Explore what soil actually is — its mineral composition, the role of organic matter, microbial ecosystems, pH chemistry, and how water and nutrients move through different soil types. Whether you're a grower, a gardener, or simply curious, this course builds a rigorous understanding of the living layer that supports nearly all terrestrial life.

A guided study of Sontag's foundational essays on aesthetics, camp, photography, and illness as metaphor — exploring what she argued criticism gets wrong and how her ideas reshaped how we talk about culture. Ideal for readers who want a serious intellectual framework for engaging with art, literature, and media.

Learn how common firearm actions — bolt-action, semi-automatic, revolver — work mechanically, how to disassemble and clean them properly, and how to diagnose and address the most frequent malfunctions safely. A detailed, diagram-driven course for owners who want to maintain their firearms competently rather than guess.

Understand the structure and legal language of wills, revocable living trusts, powers of attorney, and beneficiary designations well enough to make informed decisions — and know when you genuinely need a lawyer. This course walks through real document templates, common mistakes, and the probate process your estate will navigate.

Understand why bridges sway, how a bicycle stays upright, and what makes a spinning top defy gravity — all through the intuitive logic of Newtonian mechanics explained with diagrams and worked examples. No calculus required; this course builds genuine physical intuition about force, torque, momentum, and equilibrium.

Move beyond ancestry apps and learn how to rigorously trace lineage using census records, vital records, immigration documents, church registers, and military files. This course covers source evaluation, conflicting evidence, and how to document your findings so they hold up to scrutiny.

Learn the physics of mechanical advantage, the language of load-bearing knots, and how arborists and riggers safely manage weight and force in trees and on structures. A well-illustrated reference course covering rope selection, block-and-tackle systems, and the calculations that keep people alive when gravity is working against them.