What Do You Know About Africa?
What do you think of when you hear the word AFRICA?
Do you think of safaris? And villages?
You might think of drums and dancing. Or do you think of something else?
These are stereotypes of Africa, which means they are a conventional, over-simplified image or impression of the country.
Science News – Solar Storms Due to Hit Earth
This weekend the Earth is due to be hit by a pair of solar storms that might affect radio and satellite communication. But how and why does this happen?
What Does Solar Mean?
Anything that is related to a sun is commonly described as being solar. Our sun is a typical medium-sized yellow star which is about 5 billion years old. Its surface temperature is about 5,500°C, but even that isn’t as hot as its superheated centre. Some parts of the sun’s surface are cooler, with a temperature of between 2,700–4,200°C, and these appear darker when viewed through specialised telescopes. These cooler patches are caused by fluctuations in the sun’s magnetism and are called sun spots.
LETS Swap!
Pokemon cards, Moshi monsters, jelly stickers, friendship bracelets – at some point over the last few years my kids have swapped all these things. And in return they get good stuff back.
Wouldn’t it be great if you could go into a shop and, even if you had no money, you could still swap something you had for something you want?
In communities all over the world, people are doing just that. Or something very like it.
Local Exchange Trading Schemes or LETS for short, enable people who live near each other to swap their skills and receive goods and services without having to pay a penny.
Winter Wonderings – Are Snowflakes Really All Different?
It’s a common belief that no two snowflakes are the same, and in a way this is true. No snowflake can ever be completely identical to another, because when you get down to the molecular level they will have slightly different kinds of water molecules, different electrons and different traces of other materials such as specks of dust.
However, if we’re talking only about the appearance and shape of a snowflake, then yes it is possible that some will have duplicates. Snow crystals can vary from fairly simple, hexagonal structures to the more complex and delicate shapes that we commonly think of as snowflakes.
The simple flakes have far fewer molecules than their larger cousins and so it’s entirely possible that you could find two that appeared identical when viewed through a microscope. The more complex structures, however, can have more than a hundred different features and each feature can form in a number of different ways. This makes it highly unlikely that you would ever find two large snowflakes that looked the same – but you could have fun trying!
For a more detailed explanation of the science behind the forming of snowflakes, check out this video