Curated Video
Half-life
Originally used in relation to radioactivity, describing the time required for half the atoms of a radioactive substance to decay. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and...
Curated Video
Weathering: The Breakdown of Rock by Physical and Chemical Processes
The breakdown of rock into smaller pieces by physical and chemical processes at the Earth's surface. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions....
Curated Video
ATP
Adenosine Triphosphate, a molecule that acts as an energy store in all living cells. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science...
Curated Video
Mineral (biology)
An inorganic chemical element necessary for human growth and health, such as iron, sodium, potassium, or magnesium. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual...
Curated Video
Electrolytic cell
An electrolytic cell is a system that breaks down chemical compounds by electrolysis. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science...
Curated Video
Exothermic
A chemical reaction or process that releases heat. 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...
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Harmful Drugs: Heroin
Heroin is found in many different powdered forms, often mixed with other dangerous substances. How does Heroin affect the brain, and how does this make it one of the most dangerous drugs? Biology - Healthy Living - Heroin is a drug made...
Curated Video
Harmful Drugs: Ecstasy
Ecstasy, also known as MDMA, is one of the most commonly used harmful drugs. How does the drug affect the brain and body, and what are the long-term repercussions associated with its use? Biology - Healthy Living - Ecstasy is a drug...
Curated Video
Salt: Food Preservative
Salt was discovered thousands of years ago as a way of preserving food. How does it do this? And what else does salt preserve? Chemistry - Chemical Industries - Learning Points. Food rots because of bacteria and fungi. Salt is an...
Curated Video
Oxygen and Combustion
Combustion reactions are vital: from keeping us warm and cooking our food, to providing electricity and propelling rockets into outer space. What do we know about these chemical reactions? Chemistry - Reactions - Learning Points....
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Defensive Plants - Plant Protections
Plants have developed an array of chemical, mechanical and mimicry methods to fight off predators, meaning that they are not as defenceless as they seem. Biology - Plants - Learning Points. Plants have evolved defence mechanisms to ward...
Curated Video
Acids and Alkalis: Part 2
Alkalis and acids can be neutralised to great and varied effect. For example, it is neutralisation reactions that help us breathe underwater or cure indigestion. Chemistry - Reactions - Learning Points. A neutral solution is pH 7 Sodium...
Curated Video
Contraception: Barrier Methods
Discover how barrier methods of contraception can not only prevent pregnancy but stop the spread of sexually transmitted infections. Biology - Being Human - Learning Points. Barrier method contraceptives prevent the sperm from reaching...
Curated Video
Why Do Leaves Change Colour?
Throughout the year, some leaves change colour from green, to yellow, to red. Discover the role chlorophyll, carotene and anthocynanin pigments play in making this happen. Chemistry - Reactions - Learning Points. Leaf colour depends on...
Curated Video
Harmful Drugs: Cannabis
Cannabis is a controversial drug: there are debates around its production, legal status and use. What are the facts behind the use of this drug, and how safe or dangerous is it? Biology - Healthy Living - Cannabis is a mild sedative and...
Curated Video
Harmful Drugs
Some drugs are used recreationally, with potentially harmful consequences. Find out which drugs are used inappropriately and the harm they can cause. Biology - Healthy Living - Learning Points. Drugs affect the chemical processes in our...
Curated Video
Forms of Energy
Energy comes in many forms. What are they, how do they differ and what can they be used for? Physics - Energy And Radioactivity - Learning Points. Energy is converted or transferred, but never lost. Energy is measured in joules (j)....
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How Do Fireworks Work?
Fireworks combine chemical processes, from combustion to spectroscopy, to create spectacular displays. Discover what happens when the fuse is lit. Chemistry - Reactions - Learning Points. Fireworks involve combustion and exothermic...
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Nitrates: Food Preservatives
Potassium nitrate is a natural substance found in your food, or in an exploding firework. What makes it so versatile? Chemistry - Chemical Industries - Learning Points. Potassium nitrate preserves our food and is a component of...
Curated Video
Forming Iron Sulfide
We examine the different properties of iron and sulfur when they are mixed and when they are chemically combined. When iron and sulfur are mixed they retain their individual properties. When they react chemically to form iron sulfide...
Curated Video
Extraction of Aluminium
Explore the difficulties of extracting aluminium from its ore, and how the vast quantities of heat and electricity generated by electrolysis allow this to happen. Chemistry - ReactionsLearning Points. Aluminium is difficult to extract...
Curated Video
Redox Reactions
For centuries, humans have been extracting metals from molten ores. Today, the basic technique remains the same, but how does extraction work? Chemistry - Reactions - Learning Points. Metals can be extracted from rocks if they are heated...
Curated Video
Chemical Contraception
Introducing the basic principles upon which all chemical methods of contraception work, and how the methods of delivery vary. Biology - Being Human - Learning Points. There are many chemical methods designed to prevent pregnancy....
Curated Video
Energy Transformation
Discover how energy from the Sun is converted into different forms, and what happens to energy that is 'lost' from a system. Physics - Energy And Radioactivity - Learning Points. The Sun provides almost all the energy on Earth. Energy...