Along the River During Qingming Festival (Song Dynasty, 1100s AD) What is Qingming Jie? Like Chinese New Year, Qingming Jie is a Chinese spring festival marking the beginning of spring [...]
Ancient China religion: Han dynasty animal sacrifice (ca. 200 BC-200 AD) China's ancestor worship In the Shang Dynasty (about 2000 BC), the earliest period we know much about, people in China [...]
Diagram of a sulphur atom Sulphur atoms fall near the middle of the scale: they are heavier than silicon but lighter than iron. Every atom of sulphur has 16 protons [...]
A hard-boiled egg To check out some sulphur for yourself, take an ordinary chicken egg and hard-boil it for about twelve minutes. Then break it open and smell the yellow [...]
Evolution of seeds: Dandelion seeds What is a seed? A seed is the egg cell of a plant, with a hard wrapper around it so it can survive on its [...]
Human sperm cells with flagella (under a microscope) - They're haploid cells. When a cell divides by meiosis, it ends up with only half the amount of DNA it had before. [...]
Fish eggs: Egg evolution starts with soft eggs like these When did the first eggs evolve? The earliest living creatures made babies by dividing themselves in half, so that one [...]
Reproduction: Hydra budding new hydras RNA and DNA molecules The first form of reproduction began about four billion years ago, when first RNA molecules and then DNA molecules began to make [...]
Fish eggs - eggs science project Different types of eggs This is a simple eggs science project. Check out different kinds of eggs and you'll see the difference between fish [...]
Boa Constrictor snake Some kinds of amphibians evolved into reptiles about 300 million years ago. At this time, plate tectonics had moved more and more of the land on Earth into [...]
