Before you read this, I suggest you read post 16.30. In post 20.27 we met optical isomers – molecules that have thee same atoms joined to each other but are not identical to their mirror images. Isomerism is the existence of different molecules with the same chemical formula; the different molecules are called isomers. Isomerism… Continue reading 20.32 Isomerism

The picture shows a line of length a and another line of length b that are joined to make a line of length a + b. Note that a is longer than b. Now if a/b = (a + b)/a the result is called the golden ratio, φ. It has other names: for example, the… Continue reading 20.31 The golden ratio