Ten Equations that changed the world. (You once told me that some day you wanted me to tell you all about science and engineering. How long have you got? It's all so fascinating and we take it too much for granted.)
60 Professional Cooking Diagrams and Charts That Simplify Cooking : diyncrafts
simple harmonic motion+GIF - Google 搜尋
Writing is hard, and writing without repeating yourself is very, very hard—but as you may have already noticed, one of the most repeated words in English is the intensifying modifier "very.