These nettles have tiny hairs

[pumpui momo]

These nettles have tiny hairs, called trichomes, that are essentially little hypodermic needles waiting to inject their contents into your skin. Inside them is a fluid containing formic acid, histamine, acetylcholine and serotonin. It's why the word nettle derives from the Anglo-Saxon word "noedl" (needle) and its scientific name Urtica means "to burn".

อ่านต่อเพิ่มเติม โรงเรียนไทยรัฐวิทยา 88

สาระสำคัญ ลูกตา