EXPLORING SPACE

Life cycle of a star

Stars are hot balls of gas. They are held together by their own gravity. The nearest star to the Earth is the Sun. They give out light of their own due to nuclear reactions. 

What are the stages in the life cycle of a star?

● The life cycle of a star is determined by its mass. The larger the mass of a star the shorter will be its life cycle. The life of a star ranges from a few million years to a billion years, depending on the mass. 

● It is believed that stars are born from collapsing dense clouds of dust and gas found in spiral galaxies. These clouds are called molecular clouds or nebulae and are made up of 97% hydrogen and 3% helium. 

● When the nebula collapses under its own gravitational force, it breaks apart and results in the formation of a dense sphere called a Protostar. 

● These protostars are dense bodies of dust and gas which have not begun to generate light. As the mass of each protostar increases so does its gravity, squeezing the core of the protostar harder. 

● As the stars expand, they become less bright, due to the core running out of hydrogen and then helium. Then the star enters the main sequence or adult phase. A star remains in this phase for most part of its lifetime. 

● A star leaves its main sequence phase when it runs out of hydrogen and starts fusing helium and other elements. 

● Dim small stars are called red dwarfs. The fusion of hydrogen in them, takes place at a very slow rate and they are able to remain in the same sequence for billions of years. 

● The low mass stars like our sun expand and become red giants. This red giant is a large star that is bright with a cool surface. This is formed when the star runs out of hydrogen. They are very bright because they are so large. 

● Stars die in explosions called supernova. Supernova leads to the core compressing into a neutron star or a black hole. 

DID YOU KNOW?

Why do we have accents?

An accent is a way of pronouncing that is particular to a person, location or nation. There are two types. 

The first is the accent you have when you speak a foreign language, having to make words and sounds that you aren’t comfortable with. 

The second is the accent we speak our native language with, such as how the British sound speaking English in comparison to how we sound speaking it. 

To confuse us more, different areas in a country can have different accents too. 

Languages all have different sounds. It appears that as people moved around and started to live in isolated areas, they developed different speech patterns and accents. 

As the world was developed and we went through periods of invasion and settlement, new accents mixed with old. 

There are more than 2,500 spoken languages in the world today. 

QUICK RESPONSE CODES

QR Codes

QR code is short for quick response code. It is an image that can be scanned by a smartphone camera to read the information stored on it. 

What is a QR code?

A QR code is an image that stores data as a two-dimensional square grid of black and white pixels. The pattern in a QR code translates into numbers, letters and website links (URLs). These pixels are black on a white background, which makes it easy for a camera to read. A QR code is anchored by three squares around it to enable scanners and cameras to orient. The reading of a QR code takes seconds and it thus allows for quick and easy access to information. 

There are two types of QR codes:

● Static

● Dynamic 

Static QR codes: A static QR code is used to provide information that does not need to be updated. For example, a wi-fi QR code, which lets you connect to any wi-fi network instantly, or a QR code on packaged foods, which gives you information about their nutrients, ingredients and how to use them. Or those on the movie tickets, which gives you access to the movie screening hall. Once this QR code is generated, the data represented by it cannot be changed, although it can be scanned an unlimited number of times. 

Dynamic QR Codes: Dynamic QR codes can be edited at any time. The URL linked with this type of QR code redirects the user to the main URL, which can be changed if required. For example, a QR code on a business card that is used to store contact details. In case your contact number changes, then that change can be made in the QR code without having to reprint the cards. 

Applications of QR Codes 

● Advertising: A QR code can connect you to a website or some important information about a product or event. It can open a form to be filled for registration and also give additional information about the event or offers. 

●Restaurants: Since the COVID-19 pandemic, contactless menus have become popular. Restaurants make a QR code available on each table in place of bulky paper menus. You can scan this code using your mobile phone and get the digital menu on your screen. The advantage to the restaurant owner is that new dishes can be updated without the need to scratch and scribble on the menus and paper is saved as new menu cards do not need to be printed with every change. 

●Postal services and libraries: QR codes are used to track parcels and books and get information about their location. 

● Display information: A QR code can be used on products to give additional information about the product such as nutritional information, ingredients and more. In some books, like encyclopedias, a QR code may be used to lead the reader to an educational video that gives more information about the subject matter. This makes learning interactive instead of static. In museums, QR codes are placed with each exhibit. The QR code contains the information about the exhibit. In bird sanctuaries and botanical gardens, QR codes are put on trees and spots where particular birds can be spotted. 

●Digital payments: QR code technology is making a big change in payment methods. Shoppers can simply scan the QR code displayed at a shop and pay the necessary amount. When the payment is successful, both the customer and the merchant get a notification. Contactless payments are accepted by small grocery shops, vegetable vendors and big stores alike. Auto rickshaws and taxis also have QR codes that can be scanned to make payments. Payments made this way are quick and effortless. 

Concerns with QR Codes: There are some potential dangers of QR codes that you should be aware of.

● Malicious QR codes also exist; scanning these will start downloading unwanted apps on your phone. This can be a security threat. 

● A QR code can direct you to a fake bank website, thus compromising your security. 

● A third party can get your phone number when you scan a QR code. This is a privacy concern that researchers and developers are trying to address. 

Did you know?

The QR code was developed in 1994 by the Japanese corporation Denso Wave, a subsidiary of Toyota Motor Corporation, in order to track automobile parts during the assembly process. 

CREATOR OF RUBIK'S CUBE

Erno Rubik

He was born on 13 July 1944 in Budapest, Kingdom of Hungary, to poet Magdolna and glider-manufacturer Erno. He was inspired by his father's value-creating process of a target and a positive result, working with his hands.

He studied sculpture at Technical University and architecture at Academy of Applied Arts & Design, in Budapest. He became a member of Architecture Faculty. From 1967, he attended Hungarian Academy of Applied Arts and was Faculty of Interior Architecture & Design. 

While a professor of design at the academy, he pursued hobby of building geometric models. One of these was a prototype of his cube, made of 27 wooden blocks; it took him a month to solve the problem of the cube. It proved a useful tool for teaching algebraic group theory.

In late 1977 Konsumex, Hungary's state trading company, began marketing it. By 1980 Rubik's Cube was marketed throughout the world and over 100 million authorised units, with an estimated 50 million unauthorised imitations, were sold in first 3 years. Over 50 books were published describing how to solve Rubik's Cube

In early 1980s, he became editor of a game and puzzle journal called ..És játék (...And games). In 1983, he founded Rubik Studio, where he designed furniture and games. Among its products was another popular puzzle toy, Rubik's Magic along with Rubik's Snake and Rubik's 360 and more. 

In 1987 he became a professor with full tenure. In 1990 he became president of Hungarian Engineering Academy. At the Academy, he created International Rubik Foundation to support talented young engineers and industrial designers. 

He is actively involved in promotion of science in education. He works with several organizations: Beyond Rubik's Cube, Rubik Learning Initiative & Judit Polgar Foundation all of whose aim is to engage students in science, mathematics, and problem solving at a young age. 

His inspirations include Leonardo da Vinci, whom he regards as the Renaissance man; Michelangelo, whom he respects as a polymath, painter and sculptor, and M.C. Escher, who drew impossible constructions and grappled with explorations of infinity. 

In philosophers and writers, he admires Voltaire, Stendhal, Thomas Mann, Jean-Paul Sartre, Hungarian poet Attila Jozsef, Jules Verne and Isaac Asimov. In the field of architecture, he is an admirer of Frank Lloyd Wright and Le Corbusier. 

A lifelong bibliophile,  he has a special interest in science fiction, outdoor activities of walking through nature, playing sports and sailing on Lake Balaton. He is an avid gardener and collecting succulents is his favourite pastime.

WORLD’S FIRST CELEBRITY ROBOT

Sophia 

The world’s first celebrity robot is considered to be "Sophia". Developed by Hanson Robotics, Sophia made her debut in 2016 and gained international attention for her human-like appearance and advanced artificial intelligence capabilities. 

Sophia was designed to interact with humans, engage in conversations, and showcase facial expressions. Her media appearances and interviews with prominent personalities turned her into a sensation, leading to her recognition as a celebrity. Sophia's presence at events and conferences symbolised technological innovation and sparked discussions about the future of robotics and AI.

While there have been other famous robots throughout history, Sophia stands out as a significant milestone in the development of humanoid robots and their integration into popular culture. 

DO YOU KNOW

How was Detective Sherlock Holmes character created?

The adventures of Sherlock Holmes and Dr. Watson were written by the English doctor Sir Arthur Conan Doyle. 

How did Doyle create these characters? This is the story.

When Doyle started studying medicine at Edinburgh University in 1877, he met Dr. Joseph Bell.

Bell was a Scottish surgeon. He made detailed observations when diagnosing his patients. To improve his observation skills, he observed people he didn’t know. He made deductions from their recent activities. He also took part in many forensic investigations in England by using his observations with his medical knowledge. With this talent, he became the pioneer of forensic science. He showed the importance of science and observation in forensic investigations.

Doyle was so fascinated by Bell’s talent and inspired by his methods that he created the character Sherlock Holmes. He wrote 56 stories and 4 novels about Sherlock Holmes. Sherlock became so popular that various films and television series were made.

COLOUR STORY

The Origins Of Yellow

It’s not very hard to find the colour yellow all around us. Just take a look out the window and you’ll see flowers, insects and even our own clothing all brimming with this bright colour. But how did yellow come to feature in everyday life? That’s a story that starts far back in time.

Yellow in nature: Ochre

Nowadays, yellow isn’t just a colour used for decoration. It comes in a multitude of shades, from bright to light, and people use these to set a mood or depict certain emotions. But where did it all start? With yellow ochre. Known as an ‘earth pigment’, ochre is a natural mineral that is found in rocks or sand across the globe. It was among the first minerals used by humans.

Prehistory

Ancient peoples also seemed to paint their walls. One of the first cave paintings that uses yellow can be found in Lascaux, southwestern France. This cave painting of a horse is said to be around 17,300 years old! 

How it’s made…

Prehistoric yellow paint was made with clay containing yellow ochre that was mixed with spit or animal fat to create a paste. This paste would vary in shades from yellow to brown depending on the sand.

The Renaissance

How it’s made...

In the 1500s, artists used oil paints, made by mixing yellow pigment made with yellow ochre, with linseed oil. 

During the 16th century, yellow was associated with the disciple that betrayed Jesus Christ, Judas, and was used to depict envy or jealousy in artworks. It was often the colour of illness, as some cases of yellow fever would turn patients’ skin a mild shade of yellow. And later, in 18th century England, if you were seen to be a coward, you were called ‘yellowbellied’. Cowards were said to have a slippery nature, like reptiles. Some snakes and lizards have yellow undersides.

Ancient Egypt

How it’s made...

The ancient Egyptians used many natural minerals to create paints, including ochre. For brighter shades of yellow, they chose to use the mineral ‘orpiment’. Ground orpiment was blended with animal glues or natural gums to create a rich lemon or canary yellow.

In ancient Egypt, each colour had a symbolic meaning and yellow was the colour of the gods! It was believed that the skin and bones of the gods were made of gold. Meaning ‘eternal’ and ‘indestructible’, yellow was often blended with precious metals, like gold, to make depictions of the gods glow. Priests or priestesses of ancient Egypt were said to sometimes paint themselves yellow to ‘become’ closer to the gods.

The Modern Era

How it’s made…

In 1856, a chemical process that could create synthetic versions of natural pigments was discovered. This meant that more colours could be manufactured faster. At the end of the 19th century, there were over 8000 types of synthetic dyes to choose from, yellow being one of them!

New synthetic dyes meant that 18th and 19th century life was more colourful than ever! Yellow became the most popular way to attract attention in the French court. This meant that yellow hats, gloves and dresses were worn by all the fashionable folk of the time. Even famous artists were great admirers of the colour. Just think of Vincent van Gogh’s ‘Sunflowers’ painting.

What about now?

Think of Pikachu, Spongebob, the Minions and even the emojis on your phone. Yellow is a colour of cheerfulness and optimism. It is a symbol of happiness. Once a colour to help depict stories, yellow has become a main feature in our everyday lives.

TO BEE OR NOT TO BEE

It is not uncommon for certain species of insects and small critters to have evolved to have yellow markings as a way of warning predators against messing with them. Some fly-like insects mimic the distinctive yellow and black colouring of bees to trick predators into thinking they’re armed with a sting! Fire salamanders mean business though, as their bright yellow markings warn potential predators of their intensely toxic skin and their ability to squirt a highly irritating substance into the eyes or mouths of would-be threats.

From cave walls to famous artworks, clothing to a famous song, this undeniably cool colour has had a long journey through history and is bound to keep the future bright too.