On Monday, September 29, 2003, at 08:31  AM, sean mcbride wrote:

> I wrote a paper on residues on 2 million year old stone tools a few
> years
> ago (we thought the residues might be tubers) and read up a lot on
> African
> tubers.  There are a few of them.  I'll try and locate the paper and
> send it
> to you (or at least extract the relevant bits).  There is a very good
> book
> on African wild food plants but I can't remember the name.  However, I
> think
> there is a reference to it in the paper.  I'll get back to you
>

20 years ago I read a book about potential new crops. They scoured the
earth looking at all the things various people ate that are not big
crops now. Among them were quite a few African foods. I particularly
remember pictures of a big tuber the Bushmen dug up.  It was a US
government publication, I believe. Wish I could remember the title...