When astronomers measure how fast stars orbit the centers of galaxies, they find something strange. The stars at the edges of galaxies are moving much faster than they should be if only visible matter were present. This suggests that something unseen — dark matter — is adding to the galaxy...
These claims are made in a book out this week, written by Dale Spender, a lecturer at the London University Institute of Education. She argues that discrimination against girls is so deeply in coeducational schools that single sex classes are the only answer. Her case is based on taperecording...
Later, I developed a broader theory of what separates the two general classes of learners—helpless versus mastery-oriented. 出自-2016年12月阅读原文 It appeals to kids' curiosity to find out what is hidden inside. 出自-2016年12月阅读原文 Increasingly, companies are tapping into these desires dir...
Both place and time were changed, and I dwelt nearer to those parts of the universe and to those eras in history which had most attracted me. Where I lived was as far off as many a region viewed nightly by astronomers. We are wont to imagine rare and delectable places in some remote ...
As she further notes, "there is a south in the north" and there is a "north in the south", illustrated in the former as marginalized and racialized minorities residing in the North and, in the latter, as the emerging elites of the middle and upper classes in emerging economic countries ...
Classes usually peter out once you're a couple of years into graduate school. The remainder of your time is spent working on your dissertation research under the guidance of your adviser, and that's where the real training comes in. That's when you learn how to be an actual scientist, ...
The idea of dark matter dates back to the 1930s, when Swiss astrophysicist Fritz Zwicky came to the conclusion that there was too little visible matter in the Coma cluster to account for the motion of the 1,000 or so galaxies within it. Astronomers shrugged off Zwicky's theory for decades...
My sr. year I definitely want to take AP Bio but AP Enviro and Physics also seem interesting - I wish I could take them all but I don't want to take too many rigorous classes and then get mediocre grades in everything. I was on the college board site, looking at their descriptions...
Total variation in the 16 years has been 21.18 to 21.95. Giving the site a Bortle classification is not indicative of anything except that very night because that range covers several classes. However, the high altitude often has excellent seeing and superb transparency, both factors that make ...
Some of them will try to cheat or cow some others in the way the human beings often do. Here is a fairy tale from Aesop for you to enjoy. An eagle(鹰)made her nest at the top of a high tree while a cat, having found a convenient hole, moved into the middle of the trunk, and...