Science, Nature and Tech

Is The Great Wall of China Visible from Space?

The idea that the Great Wall of China can be seen from space has been around since at least 1938 and is still popular today. It certainly seems plausible that such a large, linear structure would stand out from the surrounding landscape, but it’s actually not true.

Alan Bean, the fourth man to walk on the moon, said in 1969

“The only thing you can see from the moon is a beautiful sphere, mostly white, some blue and patches of yellow, and every once in a while some green vegetation. No man-made object is visible at this scale.”

But if you can’t see the Wall from the moon, how about somewhere closer to Earth? The International Space Station (ISS) maintains a low earth orbit of between 330-435 km above our planet’s surface.

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Science, Nature and Tech

What Makes Popping Candy Pop?

Popping candy is fantastic stuff. You put it on your tongue and within seconds it’s fizzing and exploding and jumping about in your mouth. But what makes this happen? Continuing our #HaveYouEverWondered series, Sam takes a handful sweeties and finds out what makes popping candy pop!

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Written By You

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Pre-teens or teens are especially welcome to write for our #writtenbyyou section. Please have a parent or guardian contact us to give permission for you to submit an article.

Parents  – please resist the urge to ‘tidy up’ your child’s contribution. We only edit articles by our pre-teen or teen readers if the meaning is unclear, not to correct grammar or spelling mistakes. Your child has an authentic voice; we don’t meddle with it.

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Science, Nature and Tech

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.

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News & Politics

What is a Referendum?

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.

 

The UK General Election – An Explanation for Kids

How to Jump into Politics

What is it Like to Be an MP?

 

Women in Politics: Be The Change You Want To See

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