Categories

The psychology of the learner: motivation, memory, individual differences, and what a classroom does to all three.

Technology built for learning and studied honestly: tutoring systems, learning analytics, and the recurring finding that the medium matters less than the design.

Elections as objects of study: voting rules and what they do to outcomes, campaigns, turnout, and how people decide.

Electricity put to use: circuits, machines, and the generation and control of electrical power.

Chemical reactions driven by electricity, and electricity produced by chemical reactions. Batteries, fuel cells, corrosion and electroplating.

The study of electric and magnetic fields and their unification in Maxwell's equations.

Circuits built from semiconductors: analogue and digital design, integrated circuits, and the devices they are made from.

Geometry in the classical synthetic style: points, lines, circles and triangles, and the theorems that follow from the axioms without coordinates.

The mathematics of the school and olympiad curriculum, taken on its own terms: arithmetic, elementary algebra, plane geometry, and the problem-solving tradition around them.

Acute care under time pressure: triage, resuscitation, and stabilising a patient before the diagnosis is complete.

Hormones and the glands that make them: diabetes, thyroid disease, and disorders of growth and metabolism.

Designing and building things that work: applying physical and mathematical knowledge under constraints of cost, safety and material.

Geology applied to what gets built on it: ground conditions for foundations, tunnels and dams, and the landslide and subsidence risks around them.

English as an object of study: its grammar, its history from Old English onward, and the varieties it has split into worldwide.

The study of insects, the largest group of animals, and their role as pollinators, pests and disease vectors.

How new ventures start and why most do not survive: opportunity, founding teams, financing, and the institutions that make a founding easier or harder.

The chemistry of air, water and soil, and what human activity puts into them: pollutant fate, transport, and degradation.

Putting a price on what markets leave out: pollution as an externality, natural resources, and the instruments (taxes, permits) meant to correct for both.

Engineering for the environment: water and wastewater treatment, air pollution control, waste management, and remediation of what has already been contaminated.

The past of the relationship between people and the rest of nature -- land, climate, disease and resources as historical actors.