Since the publication of troll sagas in the Middle Ages, these mythical creatures have continued to captivate popular imagination, particularly in Scandinavian countries. Medieval Norwegian law even recognized the existence of trolls,...

PERSEPOLIS UNLIKE NATURAL WONDERS OF THE WORLD MANY MAN-MADE LANDMARKS FROM THE PAST COME DOWN TO US IN FRAGMENTS. SUCH IS THE CASE WITH PERSEPOLIS, CAPITAL OF ANCIENT PERSIA, A PRE CHRISTIAN RIVAL WITH ATHENS FOR THE TITLE OF CROWNING...

Archimedes principle states that if an object is submerged in a fluid, then the buoyant force acting on it is equal to the weight of the fluid displaced by that object. Buoyant force exists because pressure increases as an object goes...

Unreactive, and resistant to change by any chemical means. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary Films reinforce...

The temperature at which a solid turns into a liquid. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary Films reinforce abstract...

Different forms of the same element, composed of exactly the same atoms, in the same physical state, but in different arrangements. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and...

Any of the metallic elements from the central block of the periodic table. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary Films...

Gold can be found in many forms and has been used as currency for centuries. But what properties does it have that make it so valuable? Earth Science - Geology - Learning Points. Gold occurs naturally in many distinct forms. Native gold...

Learn about silver and why it is so valuable. Chemistry - Periodic Table - Learning Points. Silver is found in relatively small quantities on Earth. Silver is a good conductor. Silver ions have antibacterial properties. A Twig Context...

Find out why gold is a valuable metal element. Chemistry - Periodic Table - Learning Points. Gold is a rare element, found in very small quantities on Earth. Gold is the most malleable of all the metals and can be moulded, cast or bent...

What exactly are alloys? What is it about their properties that make them so useful for a huge variety of purposes, from construction to jewellery? Chemistry - Periodic Table - Learning Points. Alloys are metals mixed with other...

Learn why electron shells are responsible for the properties of elements, and whether they are stable or have violent reactions. Chemistry - Atoms And Bonding - Learning Points. An element's reactivity is determined by the number of...

Find out what happens to your money when you deposit it in a bank: while the bank must hold on to some reserves, far more is lent out. Maths - Number A Twig Math Film. Reinforce and extend the learning required by the curriculum. Twig’s...

The discovery and uses of reactive metals throughout history, and how their uses have defined the period in which they were discovered. Chemistry - Periodic Table - Learning Points. The reactivity series ranks the chemical reactivity of...

Discover how elements are formed in the centre of stars, and how some elements are formed in even more spectacular conditions. Chemistry - Periodic Table - Learning Points. Most elements were created in space. At the beginning of the...

Transition metals are the largest group in the periodic table. Find out what similarities they share, and how we make use of these metals. Chemistry - Periodic Table - Learning Points. Transition metals are found as a block in the middle...

Dwindling oil supplies mean exploration drilling is moving to far-flung reaches of the Earth. What difficulties does this pose, and what could the environmental impacts be? Earth Science - Earth's Resources - Learning Points. In the USA,...

From our bodies to the oceans and stars, everything is made of millions upon millions of tiny atoms. But what are atoms made of? Chemistry - Atoms And Bonding - Learning Points. The building blocks of all elements are called atoms. Atoms...

Find out what international trade is and how countries exchange goods. People and places -Human geography - International trade Learning Points International trade is the exchange of goods between countries. Goods that are brought in...

Journey to the Galapagos to see how cold-blooded iguanas keep themselves warm. Physical processes -Energy and energy transfer - Heat transfer Learning Points The Sun's heat energy travels to Earth as infrared radiation. Convection:...

Discover the world of minerals and learn about their uses. Material processes - Classifying materials - Minerals Learning Points Minerals are naturally occurring substances with a unique chemical make-up. Minerals have many uses. The...

Learn about the precious metals that make up mobile phones and how £1 billion worth of e-waste will eventually be dumped in landfills. People and places - Environmental awareness and care - Reduce, reuse, recycle Learning Points E-waste...

Six objects are shown on screen ... can you spot the minerals? Material processes - Classifying materials - Minerals Learning Points A range of minerals can be found on Earth. A Twig Tidbit Film - Spot the Difference. The children have...

Investigate how the land use has changed over time in the Mojave desert near Las Vegas. People and places -Human geography - Changing land use Learning Points The way we use land changes over time depending on our needs. Redevelopment is...