Chlorophyll is a green pigment that is found in almost all trees, plants, algae and cyanobacteria (bacteria that can undergo photosynthesis). The word chlorophyll comes from two Greek words that mean ‘green’ and ‘leaf’. But why is chlorophyll green? Or, put another way, what makes chlorophyll green? This post will tell you the answer!
Physical Education (often called PE or gym class at school) is a course taken throughout a person’s schooling years. But why is physical education important? This post will answer that question!
Urine is a liquid excreted by humans and animals. But why is urine yellow? This post will answer that question and then tell you a few interesting facts about urine.