Water can either be a solid, a liquid or a gas. How does matter change state? Chemistry - Atoms And Bonding - Learning Points. Ice, liquid water and steam all consist of exactly the same molecules. Evaporation occurs when the temperature...

Meet the grown-up designer babies created by Robert Graham's Genius Sperm Bank in 1970s America. Were any geniuses? Biology - Cells And DNA - Learning Points. Germinal choice was introduced by millionaire Robert Graham. Children born of...

Discover how dying stars transform into black holes, areas of mass so great that even light can't escape. Physics - Universe - Learning Points. When a star dies, it collapses and condenses into a single point, known as a singularity. The...

In 1869, Russian scientist Dmitri Mendeleev created the Periodic Table, ordering the naturally occurring elements by their structure and properties. His Periodic Table changed the course of Chemistry forever, and even predicted the...

The Large Hadron Collider, the world's longest particle accelerator, is exciting scientists around the world who hope it can recreate the moments just after the Big Bang. Physics - Universe - Learning Points. The Large Hadron Collider is...

The 17th century German chemist Johann Becher proposed that an element, phlogiston, was released when substances burned. He was wrong, and his incorrect theory led many early chemists to misunderstand the significance of some of their...

What is the difference between solids, liquids and gases? How does each state behave? Chemistry - Atoms And Bonding - Learning Points. The kinetic theory of matter states that particles are in constant motion and there are forces of...

Through organic matter, rocks and the oceans, the element central to all life on Earth is constantly on the move. Earth Science - Earth's Resources - Learning Points. The carbon cycle is a transfer of carbon between living matter and the...

Sounds can vary greatly: extremely quiet or deafeningly loud, high and shrill to low and booming. Why are they so different? Physics - Waves - Learning Points. Sound is a vibration passed to and fro along particles forming a wave. It can...

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...

We look at how a vacuum affects how sound travels. An alarm is set off and placed under a bell jar. The air is removed from the jar to create a vacuum. We can still see the hammer of the alarm clock moving, but cannot hear the sound....

Are all artificial chemicals bad for our health? Revealing the health implications of natural and artificial chemicals, and the natural chemicals which can be deadly. Chemistry - Chemical Industries - Learning Points. All matter consists...

Discover the scientific evidence that supports the Big Bang theory - from the expanding Universe to cosmic microwave background radiation. Physics - Universe - Learning Points. An expanding Universe, an abundance of light elements, and...

Deep underground in a disused mine in Yorkshire, scientists are searching for particles that can't be seen and have never been detected, but might bind our Universe together. Physics - Universe - Learning Points. Dark matter is believed...

A gaseous state of matter which contains a significant proportion of electrically charged particles called ions. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual...

Matter composed of antiparticles. For every particle of ordinary matter there is a corresponding antiparticle which has the same mass but the opposite charge. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds...

Space which contains no matter at all. 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 concepts and key...

What is it? ... It's the surface of a bubble!
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Material processes - Solids, liquids and


gases - Gases


A Twig Tidbit Film - Big Reveal. The image zooms out from an extreme close-up to full frame. The...

See how the density of an object is calculated and why some materials are buoyant.
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Material processes - Classifying materials - Propertie
s

of materials />

Learning Points
Density i
s

the...

What existed before the Universe began?
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Physical processes - The Earth and beyond - Beyond ou
r

solar system />

Learning Points
The Univer
s

e is over 13.8 billion years old.
...

What is the difference between mass and weight?
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Physical processes -Force and mo
t

ion - Gravity />

Learning Points
Mass is the amount of stuff in an object, it i
s

measured in grams and...

Discover the millions of microorganisms in soil.
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Material processes - Classifying ma
t

erials - Soil />

Learning Points
Soil is a mixture of rock partic
l

es, organic matter, air and...

Materials change state all the time, but how and why?
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Material processes - Solids, liquids and gases - Ch
a

nges of state />

Learning Points
Melting is the cha
n

ge of state from solid to...

Los átomos son partículas diminutas que componen todo en el universo, incluyendo nuestro cuerpo, con aproximadamente 7 mil millones de billones de átomos en cada persona. Un átomo tiene un núcleo central con protones (positivos) y...