This guide to using small incubators in the home or classroom looks at the various types of incubators, the necessary preparation and the actual incubation. It covers the sexing and rearing of the chicks, and possible problems, as well as tips for teachers and useful addresses.
If you break a fresh egg into a dish, the white is compact and firmly holds the yolk up. In an old egg, the white is runny and the yolk will flatten out.