Polyploidy in sea urchins

One thing I remember from my zoology student days is that nicotine causes polyploidy in sea urchins...a useful interjection if you can’t think of anything to say at a dinner party. It means that they end up with more copies of chromosomes in their cells than they are supposed to have. What I don’t get, and call me thick, is how do they light up their cigarettes in the first place????

How to x-ray a turtle (or tortoise)

If you want to x-ray a turtle (or tortoise) (go and look up the difference) (then tell me), if it isn’t a very big turtle (or tortoise), put it on top of a glass which you’ve turned upside down. The glass doesn’t show up on x-ray and the turtle (or tortoise) can’t move. Useful tip.