Over the course of 30 years, I got to write about or edit a lot of subjects. Here is a sampling listed alphabetically...

 

BUSINESS: Accounting, Banking, Business Intelligence, Communications, Economics, Internet & Web, Investing, Magazines, Management, Marketing & Sales, Newsletters & e-Comm, Policy Documents, Press Releases, Processes, Publications, Reference Books/Guides/Manuals, Reports, Software (100+ products), Strategic Communications, Taxes, Technical Editing & Writing, User Guides...

CHILDREN: Arts & Crafts, Baby Care, Child Care, Colours & Shapes, Dinosaurs, Early Math, Early Spelling, Parties & Games...

FOOD & DRINK: Acid & Alkaline Foods, Bartending, Beers & Spirits, Cheese, Coffee, Cooking, Food Combining, Food Index, Herbs & Spices, Pasta, Sushi, Vegetarianism, Wine...

HEALTH/HOLISTIC: Allergies, Arthritis, Asthma, Birth Control, Breast Cancer, Breast Self-Examination, Cholesterol, CPR & First Aid, Diabetes, Diet Comparison, Exercise & Fitness, Hazardous Materials, Headaches, Heart Disease & Stroke, Herbal Medicine, Nutrition, Osteoporosis, Psoriasis, Reflexology, Tai Chi, Vitamins & Minerals, Yoga...

HUMANITIES: Art, Canadian Government, Canadian Constitution, Cartography & Geography, Music, Medieval History, Organizational Behaviour, Philosophy, Prime Ministers of Canada, Sociology, U.S. Constitution, U.S. Federal Government, U.S. History, U.S. Presidents, Tibetan Buddhism, Western World History, World Religions...

LANGUAGES: American Sign Language, Composition, Grammar, European Phrases, various computer languages... 

LAW: Anti-trust Law, Business Law, Civil Procedure, Contracts, Criminal Law, Dispute Resolution, Evidence, Intellectual Property, Legal Writing, Legal Research, Professional Ethics, Property Law, Wills & Trusts...

MATH: Algebra, Calculus, Geometry, Metric System, Statistics, Trigonometry, Vectors & Matrices, Weights & Measures...

MEDICAL: Anatomy, Brain, Burn Treatment, Cardiorespiratory System, Cardiovascular System, Cellular Anatomy, Cellular Respiration, Chiropractic, Circulatory System, Dental Anatomy, Dermatology, Digestive System, ER Trauma, Ear/Eyes/Nose/Throat, Extremities, Immunology, Infectious Diseases, Joints, Medical Terminology, Membranes, Muscular System, Nursing, Patient Care, Pediatrics, Physical Exams, Reproductive System, SARS, Skeletal System, Skin, Spinal Cords, STDs, Urinary System...

MISC: Aircraft, Airports, Automotive, Catalogues, Carpentry, Casinos & Gambling, Computers, Defense Products & Systems, Espionage, Feng Shui, Games, Gardening, Home Inspection, Home Maintenance, Home Renovations, Movies & Television, Painting, Parts Books, Pets & Livestock, Plumbing & Wiring, Race Cars, Tests & Exams, Travel, Wildlife, Weapons...

SCIENCE: Abnormal Psychology, Astronomy, Biological Kingdoms, Biology, Cellular Biology, Chemistry, Communicating Science, Conductors & Semiconductors, Electrical Engineering, Electricity & Electronics, Geography, Geology, Genetics, Inorganic Chemistry, Laboratory Basics, Light & Optics, Maps & Cartography, Mars, Metallurgy, Organic Chemistry, Particle Accelerators, Particle Accelerator History, Periodic Table of the Elements, Pharmacology, Planetary Science, Psychology, Satellite Systems, Solar System, Space Probes, Thermodynamics...