An Event That Changed Billions of Years of Earth’s History Imagine if you stopped receiving oxygen; within seconds, your brain would stop functioning, and within a few minutes, the brain would be severely damaged, leading to death. Now imagine a world without oxygen; obviously, there would be no complex life, including reptiles, birds, mammals, flowering plants, and humans, and the oceans might appear reddish-brown due to the presence of unoxidized iron; the landscape of Earth might almost look like present-day Mars. The ultraviolet rays from the Sun would directly hit the Earth due to the absence of the ozone layer. In one sentence, there would be no aerobic life; only microorganisms that can survive without oxygen would exist. Your imagination was real; billions of years ago, Earth used to be like this. In 1927, a geologist named A. M. MacGregor was studying very old rocks [1] in present-day Zimbabwe. Inside one of these rocks, he found small, smooth, rounded pieces of a golden-color...
A Small Discovery That Changed Our Understanding of Nature The butterfly effect was introduced by the American meteorologist Edward Norton Lorenz in the early 1960s. While simulating weather patterns on a digital computer, Lorenz used a mathematical model based on 12 variables, such as temperature, humidity, and wind speed. To save time, he restarted the simulation from the middle instead of running it again from the beginning. He entered the weather values from an earlier simulation. However, the computer had originally stored these values with 6-digit precision, while the printed output rounded them to 3-digit precision. For example, the value 0.506127 was printed as 0.506. Although the difference seemed insignificant, the new simulation eventually produced a completely different weather pattern from the original one. This led Lorenz to realize that even a small change in the initial conditions of a complex system (a network of many interacting components) can grow over time and p...