1975, Daily Micromigration: "The diatoms Hantzschia virgata reside about a millimeter below the surface of shoreline sand ( left ). During daytime low tides the organisms are propelled upward to the surface by mucus forced through pores at the end of their elongated, glassy cell wall ( right ). The diatoms remain in the sunlight, for photosynthesis, until moments before the sand is inundated by the returning tide." 1975 Radical Revision of Continents and Poles "Of the various hypotheses that preceded the modern theory of plate tectonics, one version propounded by Alfred Wegener early in the 20th century stands out. Wegener had access to only a small part of the information available today, yet his theory anticipated much that is now fundamental, including the movement of the continents and the wandering of the poles. When his view did replace the older model (in the 1960s), the change represented a radical revision of a well-established doctrine. In the interim, Wegener's theory had at best been neglected, and it had often been scorned. At the nadir proponents of continental drift were dismissed contemptuously as cranks." On supporting science journalism If you're enjoying this article, consider supporting our award-winning journalism by subscribing. By purchasing a subscription you are helping to ensure the future of impactful stories about the discoveries and ideas shaping our world today. 1925 Spring Vegetation on Mars "A series of photographs of Mars made by Slipher at the Lowell Observatory show in a very beautiful and convincing way how the dark regions grow larger and deeper in hue…