stick it in the microwave for a while, see what happens
Yam
actually there is a pretty cool science demo you can probably do
I've seen the demo done on videos - put if you insert electrodes at either end and pass current through it you'll probably get it to glow bright red, seriously - I've seen it done with an aubergine
I'd try it and report back but you can't buy yams in Belfast 
wtf is a yam, is that some fancy pants name for a sweet potato?
Here's some yams, with a black man looking at them. You can almost smell the authenticity: -

They're not sweet potatoes, even though a google image search of "yam" produces a lot of pictures of sweet potatoes. Stupid internet cunts. 
there's a levantine diety yam, but i couldn't find an image:
http://en.wikipedia.org/wiki/Yam_%28god%29
the hindu yam is the judge of the dead, it sez here:
http://buddhistartifacts.com/item_detail.php?itemID=242&sortby=&typeID=1&keyValue=16
more here, scroll down about 2/3:
http://www.vastusindhu.com/vastumandal.htm








I got a yam. Any recipes?