This video demonstrates how the human eye will average or blend fast-flashing red, green and blue lights to produce violet light.  However, if a ball containing the red, green and blue lights are spun the individual lights are clearly visible.  This is because the eye will not merge the separate colours if they...

This video explores the fate of the universe from an historical position. It explains how the rate of expansion of the universe can be measured.

This video provides a brief introduction to the seven base units used in physics. Base units are identified with their symbols and S.I units.

The origin and definition of the metre is explained and reference to Wikipedia is made for definitions of the other base units....

This issue of Big Picture provides lots of interesting information about flowering plants and their uses. 

The plant hormones animation explores the action of indole-3-acetic acid (IAA) and shows how scientists used experimental evidence to explain the role of auxins in a phototrophic response.

The...

This video explains the difference between unpolarised light and plane polarised light in terms of using a slit to eliminate unwanted electric wave orientations. It is a continuation of Electromagnetic waves: why they are transverse....

Charlotte is a Pollution, Prevention and Control Officer for the Environment Agency - "you could say I'm a policeman for the environment". In the video Charlotte explains that she found it a challenge being a woman in chemical engineering but had support from her university professor. The Environment Agency offered...

This video demonstrates population sampling techniques by investigating whether the number of buttercups in our chosen field differs from the top of the hill to the bottom.

These resources from the Wellcome Trust look at how populations grow, change and move, and why understanding them is so important. The resources use real research to illustrate many aspects of the study of populations, including:

• ecology
• epidemiology
• ...

Portia works with other scientists and engineers to work on systems that will go into space.  She explains how she is working on a project to build a robotic arm to work on samples from Mars.  Portia studied Physics and then Space Engineering at university. 

There are two cuts of the video – one aimed at...