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<div class="moz-cite-prefix">Cool. I just tried to demonstrate
electric circuits for my brother's kids. Piece of advice: make
sure you have flexible and easy to handle wires. And getting small
lightbulbs is getting hard (torch lightbulbs are still sold here).
However, they liked decoding resistors and my brother did a neat
setup with the LEDs I bought. I also electrolysed some water. <br>
<br>
On 2013-12-18 18:58, spike wrote:<br>
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<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I
am open to suggestion for how to present irrationals in a
more friendly way, especially since I have more bad news for
that lad: most numbers are irrational. Depending on how you
count them of course. There are infinitely many rationals
of course, but there are infinely many more irrationals,
since you can give me *<b>any</b>* two rational numbers and
I can give you infinitely many irrationals that fit between
them, larger than the smaller and smaller than the larger.
Of course, I can also give you infinitely many rational that
fit between the two as well, but between each of those
between the two are infinitely many irrationals.<o:p></o:p></span></p>
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style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span><br>
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<br>
I would do an exploration of the number line. Go through the
fractions and plot them, so he can see the neat pattern they form.
And that there are always gaps - between every two rationals there
will be space for some (indeed, a lot) of irrationals. <br>
<br>
Incidentally, anybody who has a good idea for how to make an
adjustable Faraday cage to experiment with a tunable (and
repeatable) bad reception environment for a cellphone? <br>
<pre class="moz-signature" cols="72">--
Dr Anders Sandberg
Future of Humanity Institute
Oxford Martin School
Oxford University
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