为何冻冰块时会长出尖刺?
译自：多伦多大学非线性物理实验室 为什么冰会长出尖刺呢? 一句话解释：冰在急冻时处于过冷状态，冰的表面会出现小孔洞，这样冻结时水会膨胀。 随着冰冻的继续，冰面内不断膨胀的冰迫使剩余的水通过孔，并在边缘周围冰冻，形成钉状。 最终，整块冰冻结后也就形成了尖刺。 具体来说：冰块晶体的形式与冷却速率有关，也…
Scientists Took Mentos And Coke to The Top of a Mountain, For Science
Adding pellets of Mentos mint candy to carbonated beverages has been a science fair staple for years. While most ten-year-olds can tell you why it spe…
The silence of the owls
No one knows exactly how the nocturnal hunters manage their whisper-soft flight, yet it is inspiring the design of quieter airplanes, fans and wind tu…
Scientists Discover Two Mating Flies Trapped in Amber 40 Million Years Ago
Forty or so million years ago, on the southern end of the Gondwana supercontinent, two mating insects unexpectedly found themselves in a sticky situat…
[科普]生活中常见物品的化学成分：厨房/调料篇
[malicTOC] 厨房/调料 食用盐 盐乃百味之首。食用盐指的是以“氯化钠（化学式：\( \text{NaCl} \) )”为主要成分的食品添加剂。 氯化钠对于地球上的生命非常重要。大部分生物组织中含有多种盐类。血液中的钠离子浓度直接关系到体液的安全水平的调节。由信号转换导致的神经冲动的传导也是…