What do airplanes, power plants, ships, and explosions have in common? They all make clouds!

Earth's orbit has a bit of a litter problem. Hank outlines a few ways scientists have thought of to help clean things up.

A suspension of very fine liquid or solid particles in a gas.
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A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science...

Easily broken down by biological activity, especially bacteria in the soil.
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A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions....

Is it possible to travel through time? Do the laws of physics make it impossible? How could it be achieved? Physics - Waves - Learning Points. Although the science is theoretical, the laws of physics do not rule out time travel. Einstein...

Humans can only hear a certain range of sound frequencies. Discover the sounds we can't hear and why they can be useful. Physics - Waves - Learning Points. The frequency of sound waves determines whether we can hear them. High-frequency...

Investigating why peregrine falcon populations are threatened by pollution from industry thousands of kilometres away. Biology - Ecosystems - Learning Points. The peregrine falcon lives remotely but is affected by man-made chemicals....

The range of electromagnetic radiation in the electromagnetic spectrum is huge. Where does this radiation come from and how do the frequencies and wavelengths vary? Physics - Waves - Learning Points. Electromagnetic radiation is all...

Diamonds take millions of years to form within the Earth's mantle, but now scientists are trying to produce them synthetically. Chemistry - Atoms And Bonding - Learning Points. Diamonds take a long time to form in the Earth's mantle....

Climate varies across the world, producing distinct climate zones. Discover the many factors that create these differences. Earth Science - Weather - Learning Points. Climate varies across the world. The world can be divided into six...

The study of climate, long-term weather patterns and behaviour, rather than its short-term fluctuations. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions....

Earth’s Resources explains the usefulness of Earth’s physical resources as raw materials for the man-made world by describing the usefulness of these resources.

A fun music video featuring airplane condensation trails, also known as vapor trails. These common man-made clouds form behind high-flying aircraft as skinny lines but then they may spread out to merge with natural cirrus clouds.