Catalyst Volume 22 Issue 3

This issue of Catalyst includes the following articles:

The Price of Rice

This article looks at how genetics has increased yields of rice, a staple food for billions of people.

What Causes the Aurora?

The aurora borealis is caused by the interaction of the solar wind with the Earth's magnetic field. This article explains how satellites are testing thoeires of how this happens.

The Kilogram

This Catalyst article looks at the changing definition of the kilogram, a unit of mass and a base unit in the SI system (the International System of units).

What's in a Cell?

This Catalyst article explores the complex structure of cells, and numerous theories of how they were formed.

Zombie Invasion

This article looks at how Californians are being encouraged to prepare for the next big earthquake.

Seven Billion - and Counting

The human population of Earth has reached seven billion. This article explores the impact human activity may have on the planet.

Marie Curie - a Life of Discovery

This article looks at Marie Curie who discovered two radioactive elements and showed that radioactivity was a property of atoms, not compounds.

Going Bananas about Radioactivity

This article looks at how we are exposed to radiation from many different sources, including the food we eat - even bananas.

Catalyst is a science magazine for students aged 14-19 years. Annual subscriptions to print copies of the magazine can be purchased from Mindsets.

Resources

The Price of Rice

This Catalyst article looks at the production of rice, which is a staple food for billions of people. It describes how crop scientists have identified varieties of rice with favourable characteristics, such as flood resistance, and are using them to develop crops with increased yield. Such crops may help to...

What Causes the Aurora? *suitable for home teaching*

This article from Catalyst looks at aurora borealis caused by the interaction of the solar wind with the Earth's magnetic field. It also explains how satellites are testing thoeires of how this happens. Auroral light emission occurs at roughly 100 km altitude. Energetic electrons in the solar wind cause the...

The Kilogram

This Catalyst article looks at the changing definition of the kilogram, a unit of mass and a base unit in the SI system (the International System of units). It has been found that the International Prototype Kilogram (IPK), made in 1879 and kept in a vault in Paris, has lost about 50microgrammes of mass over the...

What's in a Cell? *suitable for home teaching*

This Catalyst article explores the complex structure of cells, and numerous theories of how they were formed. It describes how the development of electron microscopes has allowed greater detail of cellular strutures and organelles to be understood. The article includes detailed electron micropgraphs, along with...

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