Group 1 - The latest "Science" Rumor List debunks popular health myths, including misconceptions about swimming after meals, the growth of intestinal polyps, and the effects of shaving facial hair [1] - The claim that swimming immediately after eating causes leg cramps is clarified; cramps are more related to electrolyte imbalance, muscle fatigue, and inadequate warm-up rather than blood flow diversion [2] - It is advised to wait 30 to 60 minutes after a heavy meal before swimming to avoid discomfort, not specifically to prevent cramps [2] Group 2 - The myth that intestinal polyps will grow more if surgically removed is debunked; timely removal is necessary to prevent cancer risk, and new polyps may appear due to genetic factors or lifestyle, not the removal process [4][5] - The belief that frequent shaving makes facial hair coarser is a common misconception; hair thickness is determined by follicle structure and genetics, not shaving [6][7] - The idea that early use of glasses in children worsens myopia is incorrect; eye shape changes are a result of worsening myopia, not the use of corrective lenses [8] Group 3 - The misconception that electric vehicles leak electricity in the rain is addressed; modern electric vehicles are designed with high waterproof standards, ensuring safety during rainy conditions [9] - The claim that injecting telomerase genes can reverse aging lacks scientific support; aging is a complex process influenced by multiple factors, and current research is not yet applicable to humans [10] - The belief that tea residue enhances teapot quality is misleading; tea residue can harbor harmful substances and should be cleaned to maintain hygiene and flavor [11][12]

Group 1 - The length of the ingredient list does not directly correlate with food safety, and shorter lists do not necessarily indicate healthier options [6][7][8] - Food safety is determined by the type and amount of additives used, rather than the number of additives present [7][9] - The concept of "zero preservatives" can be misleading, as preservatives play a crucial role in preventing food spoilage and ensuring safety [9][10] Group 2 - Sunlight exposure through glass does not effectively contribute to calcium absorption due to significant reduction in UVB penetration [2][3] - The optimal times for sunlight exposure to synthesize vitamin D are between 9-10 AM and 3-5 PM, with 30-60 minutes of exposure recommended [3] - Solar panels do not emit harmful electromagnetic radiation, and their operation is well within safety standards set by health organizations [4][5]