A generation before the sack of Rome in 476, Roman culture and civilization in its British territories had dwindled to an almost negligible point. So […]
We have all heard that the secret to a better brain lies in a diet rich with superfoods like fish oil, vitamins, power drinks, and antioxidants. But what are the truths behind these claims? […]
During and just after World War II, the quest for ever faster fighter planes reached an apparent natural barrier—the speed of sound. Yet, on approaching this limit, aircraft became unstable and uncontrollable. In this full lecture, discover how a new approach to aircraft design solved the problem of compressibility and shock waves in this transonic region, paving the way for supersonic flight and paved the way to breaking the sound barrier. […]
Examine the nuances of alternating and direct currents, see how transformers use electromagnetic induction to transform voltage levels in AC circuits, and observe the role of diodes and capacitors in regulating current. See how the DC power supplies that charge our cell phones are constructed so that they convert alternating to direct current. […]
Whereas the Greeks had largely focused on simple temple architecture, ancient Roman architecture took the concept of public buildings, and created structures unlike the world had ever seen. […]
Flowering plants arrived relatively late in geological time, between 290 to 145 million years ago. But once here, they evolved quickly and often displaced many other types of plants. In fact, in terms of species, flowering plants are the dominant plant form on Earth today with more than 300,000 types. Learn how their unique reproductive mechanisms led to this explosion of speciation in such a relatively short time.
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