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Welcome to the twenty-fifth issue of Science in School

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The print copy of this issue of Science in School has a mass of nearly a quarter of a kilogram. But do you know how a kilogram is defined? And did you know that the definition of a kilogram may be about to change, with the help of CERN?

The mystery of altruism

By Oren Harman

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Does true altruism exist? And can science provide the answer?

Weighing up the evidence: what is a kilo?

By Eleanor Hayes and Marlene Rau

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We all know what a kilogram is – or do we? Researchers worldwide are working to define precisely what this familiar unit is.

The changing face of orthodontics

By Sophie and Georges Rozencweig

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Many of us have had our teeth straightened with braces. Few people know, however, that orthodontics involves a great deal of fundamental science and fast-moving technology.

Science in the open: bringing the Stone Age to life for primary-school pupils

By Petra Breuer-Küppers

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Taking pupils out of the classroom opens up a whole range of activities for teaching young children about the natural world.

Galileo and the moons of Jupiter: exploring the night sky of 1610

By Carla Isabel Ribeiro

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Learn how you and your students can use mathematics to study Jupiter’s moons.

Exploring scientific research articles in the classroom

By Miriam Ossevoort, Marcel Koeneman and Martin Goedhart

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Learn how to use research articles in your science lessons.

Movers and shakers: physics in the oceans

By Susan Watt

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Contrary to the popular saying, deep waters are often far from still – which is just as well for marine life. Activities using simple water tanks are a good way to find out about the physics at work beneath the waves.

Magnetic science: developing a new surfactant

By Julian Eastoe, Paul Brown, Isabelle Grillo and Tim Harrison

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With the use of detergents and other surfactants on the rise, the resulting pollution is worrying. One answer: surfactants that can be collected and re-used simply by switching a magnetic field on and off.

The numbers game: extending the periodic table

By Oli Usher

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Until a few centuries ago, people believed that the world was made only of earth, air, water and fire. Since then, scientists have discovered 118 elements and the search is on for element 119.

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