An icebreaker is a ship specially designed to force its way through ice-covered waters. Whether powered by gas turbines, diesel-electric power, or nuclear energy, icebreakers are expensive to build, very expensive to run, and uncomfortable to travel in on the open sea because they roll easily. Nevertheless, icebreakers are needed to keep trade routes open where there exist seasonal or permanent ice conditions. What three features must a ship possess in order to be considered an icebreaker? Discuss
Tagore was a Bengali poet, philosopher, artist, writer, and composer whose works reshaped Bengali literature and music in the late 19th and early 20th centuries. His writings, which often exhibit rhythmic lyricism, colloquial language, and philosophical contemplation, received worldwide acclaim, and he became Asia's first Nobel laureate in 1913, when he received the Nobel Prize for Literature. Knighted by the British government in 1915, Tagore resigned the honor 4 years later in protest of what?
A star cluster is a group of related stars usually held together by gravity. Globular clusters are densely packed groups of hundreds of thousands of very old stars. Open clusters are smaller, scattered groups of younger stars. Until recently, astronomers wrestled with a great cosmological mystery: according to theories of stellar evolution, it appeared that some globular clusters were actually older than the universe itself. How was this paradox resolved?