@kimutaikatwa: Ever wondered why grass can make your skin feel itchy? It’s not just your imagination. Many grasses contain tiny silica crystals called phytoliths, which strengthen leaves and make them rough, abrasive, and less appealing to animals. These microscopic structures can irritate human skin, especially after walking through tall grass. This is part of an ancient evolutionary arms race between plants and herbivores. As grasses evolved tougher, silica-rich leaves to discourage grazing, herbivores responded by developing specialized mechanical papillae on their tongues and mouths. These tough, keratin-coated structures act like natural sandpaper, helping animals such as cows, sheep, and zebras grip, tear, and tolerate abrasive grasses while protecting their mouths from excessive wear. In this video, Dr. Katwa explains the fascinating science behind itchy grass, phytoliths, silica crystals, and how millions of years of evolution shaped both grasses and the animals that eat them. Nature’s adaptations are more remarkable than they first appear. #DrKatwaExplains #creatorsearchinsights #fyp #viral TikTok #Science

Dr. Katwa Explains

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Sunday 02 August 2026 08:50:02 GMT