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
An Aspiring Champion for Team GB
Meet Lilly Williams-Howell, a talented young skater from Prestatyn, in North Wales.
Lilly, who is now 11 years old, has been skating since age 7, and is now very close to realising her dream of representing her country. After a lot of training and practice, she now has the chance to skate at an international competition for Team GB. We talked to Lilly a little bit about her skating, and her hopes for the future.
What is a Referendum?
What is a Referendum?
There has been a lot of talk recently about the referendum on membership of the European Union. It seems that we cannot turn on the television without hearing about it! But what is a referendum?
A referendum is a vote, not an election by which we choose the people to represent us, but a choice in which all the people who can vote are asked to accept or reject (not accept) a course of action.
You can find out more about our main election, the General Election here.
What this means is that voters are called to say yes or no to a question. You might think that this sounds perfectly reasonable; why shouldn’t everyone have a say in what our country is doing? But it is not as simple as that.
Most questions are decided by votes in Parliament; after all, this is why we elect them to represent us, and in practical terms, we cannot all expect to be experts on all the subjects that must be covered by the government. So this doesn’t happen very often.
Referendums in the UK
In fact, in the UK there have only been twelve, yes, just 12 referendums since 1973. Twelve referendums over the course of 43 years, of which only two have covered the entire country. You can see that this is not a large number.
You might be surprised to learn that the first to cover the whole country was in 1975, and it was on membership of the European Economic Community (EEC), which is what the European Union was then known as. The second was in 2011, and related to a reform in the voting system known as Alternative Vote.
All the other major referendums in the UK have been related to questions of devolving power – or the governing of the distinct regions of England, Wales Scotland and Northern Ireland.
Origins of the Word Referendum
The word came into use in English in 1847. But at that time, it was mostly about Switzerland, whose system of direct democracy involved (and continues to involve) a large number of referendums. The word was coined, or created, from Latin referendum, which means “thing to be referred”. This is because, in a referendum, the decision is referred to the people.
The word referendum in Latin is from the verb referre. This verb means “to bring back, to take back’, which is the very essence of a referendum: a question is being brought back to the people who will be affected by it.
What is the Plural of Referendum?
A lot of people think that the plural of referendum is ‘referenda’, but is it really?
[perfectpullquote align=”full” bordertop=”false” cite=”The Oxford English Dictionary” link=”” color=”” class=”” size=””]Referendum is logically preferable as a plural form meaning ballots on one issue (as a Latin gerund referendum has no plural). The Latin plural gerundive referenda, meaning ‘things to be referred’, necessarily connotes a plurality of issues.[/perfectpullquote]
What does that mean?
A gerund is a grammar term used in Latin and other languages. In Latin, ‘referenda’ would mean ‘more than one thing to be considered’, whereas a referendum as a vote tends to be on one single issue.
We can use ‘referendum’ as a plural if we wish, but ‘referendums’ has also become normalised in English, as the word has been accepted in popular use in English, and of course the usual way to make a plural in English is to add ‘s’.
You can find out more about the British political system in these posts.
A Trip to Mars!
Imagine being able to catch a flight to Mars as easily as we travel to another country – that was the idea behind the Trip To Mars session I attended at the Cheltenham Science Festival. It was conducted by Dr Suze Kundu and Dr Simon Foster and presented as a pre-flight safety briefing, with both of them dressed as pilots! There were a lot of humorous moments and sci-fi references but also some great science.
Suze and Simon suggested that in the future, flights to Mars could be far quicker than they are now, and explored how some of the bigger problems could be overcome. For example, the Sun’s magnetic field deflects a significant proportion of the cosmic radiation that could be harmful to humans on Earth; as spaceships travel further away from the Earth and Sun they will have less protection because the magnetic field weakens. To combat this it’s possible that spaceships will contain or be covered with large and powerful magnets, to produce the same deflective effect. This would have the added advantage of also deflecting radiation from solar flares.
Spaceships journeying to Mars would travel at such speed that even tiny fragments of rock and dust could be damaging to the hull. To combat this, and also the heat generated when the spaceship passes through an atmosphere, Suze and Simon discussed the possibility of spaceships being coated in aerogel. This amazing material is a solid formed from silicone dioxide but is 98% air; this means that it is extremely light but also strong. Its melting point is 1,200°C (equivalent to asbestos) and it is a wonderful insulator. Because it consists of large pockets of air between thin layers of silicone dioxide, any dust or rock fragments that hit it would be slowed and stopped before they could penetrate the aerogel completely.
Suze and Simon also discussed the possibilities and problems with cryostasis. Theoretically this is when a person’s body is cooled to temperatures so low that they enter hibernation, ideal for long journeys through space. Unfortunately our technology isn’t advanced enough to do this at the moment; any attempt would result in the cells rupturing and the person dying. But in the future it will be possible, perhaps after the person’s DNA has been altered slightly so that they can produce antifreeze proteins like some species of wasps and turtles.