Knitted DNA from Kimberly Chapman
Link via Boing Boing.
"This is a knitted model of DNA, complete with GC/TA base pairs represented by orange-green bars with a pointed join and blue-yellow bars with a stepped join (because there weren't enough stitches to make a wave or curve), replicating the standard simplified DNA model. As you can see from the pictures, it also makes a good toy insofar as it holds its shape while squished or stretched, because it is stuffed firmly with cotton balls. It also can be balanced on its end with some effort."