Re: "Poison air" blocks (was: Analog as "manual?)

On Mon, 15 Aug 2005 06:42:47 -0000, msb@xxxxxxx (Mark Brader) wrote:

>Peter Moylan writes:
>> For children, I think the best explanation is still along the
>> lines of a distinction between "counting numbers" (integers) and
>> "measurement numbers" (reals). I'm reminded of those "poison air"
>> blocks that were imposed on my sister in primary school. Those
>> most definitely gave a digital emphasis to arithmetic.
>
>What on earth is a "'poison air' block"?

The thing that failed and made an airliner crash at the weekend?


--
Steve Hayes from Tshwane, South Africa
http://www.geocities.com/Athens/7734/stevesig.htm
E-mail - see web page, or parse: shayes at dunelm full stop org full stop uk
.

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