Anyone know the difference between a plant and an animal?
March 7, 2006 11:43 amHint for the good people charged with educating our off-spring.
This is a sheep:
A sheep is an animal. It goes baaah.
This is cotton wool:
It is a plant. It does not go baaah.
Now have a listen to the clip of a representative of the same people who bought you the rainbow sheep
Cotton is pure cellulose, a naturally occurring polymer. Cellulose is a carbohydrate, and the molecule is a long chain of glucose (sugar) molecules. If you look at the structure of a cellulose molecule you can see the OH groups that are on the outer edge. These negatively charged groups attract water molecules and make cellulose and cotton absorb water well. Cotton can absorb about 25 times its weight in water. Chemists refer to substances like cotton as hydrophilic, which means that they attract water molecules.11081
Wool fibre has evolved over 25,000 years to create a uniquely complex structure of interlocking protein molecules, surrounded by electrically charged lysine side chains. Through a natural process called ‘hydrogen bonding’, these side chains electrically attract water vapour molecules. The wool fibres actually pull the moisture vapour away from the skin.
Here is the origin of the rhyme. Part of it says:
The wool industry was critical to the country’s economy from the Middle Ages until the nineteenth century so it is therefore not surprising that it is celebrated in the Baa Baa Black Sheep Nursery Rhyme. An historical connection for this rhyme has been suggested - a political satire said to refer to the Plantagenet King Richard III (the Master) and the the export tax imposed in Britain in 1275 in which the English Customs Statute authorised the king to collect a tax on all exports of wool in every port in the country. But our further research indicates another possible connection of this Nursery rhyme to English history relating to King Edward II (1307-1327)
I’m sure you’d like to let Surestart know your feelings on the matter.
