The Five-hundred-meter Aperture Spherical Telescope (FAST), the world's largest single-dish radio telescope, is located in a natural karst basin in Guizhou, China. Designed to detect radio waves from distant parts of the universe, FAST has a massive 500-meter diameter spherical mirror and is estimated to be three times more sensitive than the now-defunct Arecibo radio telescope in Puerto Rico. To ensure it can operate without interference, nearly 9,000 people were relocated from the area, and all electronic devices are banned within a 5-kilometer radius of the telescope. This is because even the smallest amount of electromagnetic noise can disrupt the telescope’s ability to pick up faint signals from space. Despite these precautions, everyday electronic devices can still pose a challenge. A microwave oven operating several kilometers away, a smartphone, a Wi-Fi network, or even a garage door remote can emit signals that interfere with FAST’s observations. This extreme sensitivity is both a strength and a vulnerability for the telescope. It allows scientists to detect incredibly faint signals, but it also means the environment around the telescope must be almost perfectly controlled—free from any electromagnetic disturbances. This sensitivity has led to some intriguing, if ultimately misleading, discoveries. At one point, researchers thought they had detected signs of an extraterrestrial civilization. However, after further analysis, the source of the signal was traced back to a much more ordinary origin—likely a human-made device or natural phenomenon on Earth. While the incident was later dismissed, it underscored the challenges of distinguishing between cosmic signals and terrestrial interference. The situation highlights the delicate balance between scientific ambition and technological limitations. The more sensitive an instrument like FAST is, the more it depends on an environment that is nearly "aseptic" in terms of electromagnetic noise. This means that even small changes in the surrounding area—like the use of a microwave or a cell phone—can have a significant impact on the telescope's ability to observe the universe. Scientists must constantly adapt to maintain the precision required for their groundbreaking research.