2.3 ‘Go Say’ science promotion events

An increasing number of science museums and science centres hold regular organised events that stand apart from their exhibitions. The Dana Centre, which now has a permanent venue in the Wellcome Wolfson Building at the Science Museum, holds 10–20 events each month. They are designed to provoke discussion through a blend of debate, art, multimedia and performance, covering issues such as the ethics of prolonging the life of foetuses, the role of science in alleviating poverty, and what is,
Author(s): The Open University

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2 Where does the need arise?

There is a rather obvious question that has to be raised at some point, so we may as well get it over with now: Why do we present ourselves with all these problems? After all, life would be easier without them and we could all go off and do jobs that don't involve them. Do we really need to know everything about the universe? Or to send people into space, at significant cost and human risk? Do we really need to send sound and pictures through space? Do we really need to communicate with peopl
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5.2 Doing and undoing

Now try the following.

Think of a number. Add 4. If my answer is 11, can you work out what number I was thinking of?

You might have said ‘What number do I have to add on to 4 to get 11?’ or perhaps ‘If I take away 4 from 11 what number do I get?’ In both cases you should have arrived at the answer 7.

In the second method ‘subtracting 4’ undoes the ‘adding 4’ in the original instructions.

This process can be illustrated by a ‘doing–undoing diagram’
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7.1 Introduction

So far we have presented two pieces of evidence pointing to the occurrence of a big bang: the redshift of the galaxies (indicating the continuing expansion of the Universe), and the 3 K radiation (the remnant of the primordial radiation). But there is a third imprint such a big bang ought to have left on our present-day world. We cannot at this juncture trace out the full sequence of events following the instant of the big bang (that can only be done after we have worked through the next two
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27. Books, Online and Off
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