A History of the World - Location - Europe Models in Science 1. Semantics: Models and Representation Models can perform two fundamentally different representational functions. On the one hand, a model can be a representation of a selected part of the world (the ‘target system’). Depending on the nature of the target, such models are either models of phenomena or models of data. 1.1 Representational models I: models of phenomena Many scientific models represent a phenomenon, where ‘phenomenon’ is used as an umbrella term covering all relatively stable and general features of the world that are interesting from a scientific point of view. A first step towards a discussion of the issue of scientific representation is to realize that there is no such thing as the problem of scientific representation. The second problem is concerned with representational styles. Although this question is not explicitly addressed in the literature on the so-called semantic view of theories, some answers seem to emerge from its understanding of models. Scale models. 2.
Big History Project (bh_p) sur Twitter Timeline World History What Is a Controlled Experiment? - Definition and Example Updated December 05, 2014. Question: What Is a Controlled Experiment? One of the most common types of experiment is a controlled experiment. Here is a look at what a controlled experiment is and why this type of experiment is so popular in science. Answer: A controlled experiment is one in which everything is held constant except for one variable. Example of a Controlled Experiment Let's say you want to know if type of soil affects how long it takes a seed to germinate. Why Controlled Experiments Are Important The big advantage of a controlled experiment is you can eliminate much of the uncertainty about your results. Are All Experiments Controlled? No, they are not. Learn More What Is an Experiment?
Alexandre Meinesz – Comment la vie a commencé Comment la vie a commencé - Alexandre Meinesz D’où vient la vie ? Comment est-elle apparue sur Terre ? Quels ont été les premiers organismes vivants ? À quoi ressemblaient les ancêtres de formes de vies actuelles ? Alexandre Meinesz spécialiste des milieux marins et des premiers organismes ayant colonisé la Terre (les algues), abordera les mystères de la vie avec un éclairage original sur l’évolution du vivant, différent de celui des microbiologistes, des généticiens ou des paléontologues.
World War I Timeline Timelines are one of our favorite history tools and an important element of the Layers of Learning curriculum. Here are some WWI events to add to a timeline. You may find more from your reading. You can put the timeline squares on a wall or in a notebook. And here is the set of printable World War I Timeline squares. A Little History Also known as the Great War and the War to End All Wars (sure wish that had worked out), the First World War changed everything. It had absolutely nothing to do with America, yet America fought in it and emerged the world leader. This is a painting by artists Wilie Stower of the Battle of Dogger Bank, 1915. WWI started because of European leaders’ posturing for power. On the Web I found a whole series of great printable resources for World War I here. And here is an excellent animated map of the Western Front from the BBC. This is a map of the Western Front in 1914. Library List from DK , World War I: A Primary Source History , Going to War in World War I by L.M.
Are We Still Evolving? Exit from comment view mode. Click to hide this space NEW HAVEN – Many public-policy decisions are based on implicit assumptions about “human nature,” and it is currently popular to speculate about how evolution might have shaped human behavior and psychology. But this raises some important questions: are humans continuing to evolve – and, if so, is our basic biological nature changing – or has modern culture stopped evolution? For some traits, we do not have to speculate – we can measure and compare on the basis of studies covering thousands of individuals over several generations. Scientists are taking two approaches. From this approach, we have learned, for example, that the ability to digest milk as adults evolved within the last 10,000 years – and several times – in cultures that domesticated sheep, goats, or cattle. Some scientists, myself included, have taken a different approach. And we expect those younger women to be shorter simply because they have had less time to grow.