SCIENCE | FACTS | BEYOND | HISTORY | on Instagram: "It looks unbelievable, but it’s completely real. This rare condition, known as a true human tail, is a medical anomaly that occurs when embryonic development doesn’t fully regress structures present early in human growth. 🧠 During early development, all humans briefly form a tail-like structure. In extremely rare cases, it doesn’t disappear — resulting in a visible, tail-like extension at birth. Most are harmless, though some can be connected

🌈 DIY レインボーアート 🎨💖 学校で作る素晴らしいカラフルクラフト 🖍️