When it comes to big science, very few things are conclusively known. From Quantum Mechanics to Natural Selection, what we have instead are theories - ideas explain why things happen the way they do. We don't know for certain these are correct - no one ever saw the Big Bang - but with them we can paint beautiful, breathtaking pictures of everything from human behaviour to what the future may hold. Profiling the key scientists behind each theory, "30-Second Theories" presents each entry in a unique, eye-catching full-colour design, with thought-provoking extras and stylish illustrations. It is essential for anyone keen on expanding their mind with science's most thrilling ideas.

Keynesian Economics, Free Market Capitalism, Monetarism, Game Theory and the Invisible Hand. Sure, you know what they mean. That is, you've certainly heard of them. But do you know enough about these economic theories to join a dinner party debate or dazzle the bar with your financial knowledge? 30 Second Economics takes the top 50 economic theories, and explains them to the general reader in half a minute, using nothing more than two pages, 300 words and one picture. Economics will suddenly seem a lot more fun than the economy, and make a lot more sense, and along the way you'll meet founding fathers of modern economics such as Adam Smith, David Ricardo and Alfred Marshall. From Marxism to Mercantilism, plus everything in between, this is the ultimate 'crash' course in economic theory.

The key ideas in Psychology explained, with colour illustrations, in half a minute. Pavlov's Dogs, Psychoanalysis, Milgram's Obedience Study, and Beck's Cognitive Therapy? Sure, you know what they all mean. That is, you've certainly heard of them. But do you know enough about these psychology theories to join a dinner party debate or dazzle the bar with your knowledge? 30-Second Psychology takes the top 50 strands of thinking in this fascinating field, and explains them to the general reader in half a minute, using nothing more than two pages, 300 words, and one picture. The inner workings of the human mind will suddenly seem a lot more fun, and along the way we meet many of the luminaries in the field, including William James, Aaron Beck, and (of course) Sigmund Freud. From Behaviorism to Cognitivism, what better way to get a handle on your inner demons?

You may be OK with standard stuff like Conservatism and Democracy, but do you really know what Patrimonialism is? And what about Oligarchy? Anarcho-syndicalism? Politics is, we are willing to bet, the most passionately argued-over subject matter, and yet how many of us flounder around in confrontational debates because we have no grip on political theory, just a vague notion that they are all out to get us? 30-Second Politics will help dispel this fog mistrust and paranoia. It challenges political theorists of all colors to come up with no-frill, no-spin, tell-it-like-it-is explanations of the 50 most important political -isms, -archies, and -ocracies that have pertained since the time of Periclean Athens. At no public expense, the book explains each political theory in nothing more than two pages, 300 words, and some propaganda-style imagery, for we all know that a picture opportunity is worth a thousand words of dull interview.

The universe literally encompasses everything we were, are and will be, everything we knew, know and can know. When we decide to understand the universe as a whole, new truths come to light, and unexpected perspectives illuminate our take on life. 30-Second Universe explains all the tantalising concepts, principles and theories that make up our knowledge - the Higgs particle, gluons, quarks, the multiverse, how certainty itself can be uncertain, and of course, where our world came from, and where we're going and what will happen in the end - and it explains these astrophysical answers succinctly, each entry taking only 30 seconds to read, with further exploration flagged, and key scientists noted. This one small book sheds light on the biggest ideas, concepts and discoveries in life, in the universe, in everything.

The 50 most thought-provoking theories of life, each explained in half a minute. 30-Second Biology tackles the vital science of life, dissecting the 50 most thought-provoking theories of our ecosystem and ourselves. At a time when discoveries in DNA allow us to feel more connected than ever to the natural world, this is the fastest route to an understanding of the tree of life. Whether you're dipping into the gene pool, unlocking cells, or conversing on biodiversity, this is all the knowledge you need to bring life to the dinner-party debate. An internationally bestselling series presents essential concepts in a mere 30 seconds, 300 words, and one image; The 50 most important ideas and innovations in biology dissected and explained clearly without the clutter; The fastest way to learn about cells, reproduction, animals, plants, evolution and ecosystems.

From Rubik's cubes to Godel's incompleteness theorem, everything mathematical explained, with colour illustrations, in half a minute. Maths is enjoying a resurgence in popularity. So how can you avoid being the only dinner guest who has no idea who Fermat was, or what he proved? The more you know about Maths, the less of a science it becomes. 30 Second Maths takes the top 50 most engaging mathematical theories, and explains them to the general reader in half a minute, using nothing more than two pages, 200 words and one picture. Read at your own pace, and discover that maths can be more fascinating than you ever imagined.