2) Bamboo is the best material for knitting needles.
Durable, but not as loud, cold, or slippery as metal; flexible and lightweight, but not as slow as wood; prettier and more warp-resistant than plastic
3) Pandas eat it. Cute.
Having a nosh
4) People eat it. Yum.
Photo credits to the following Flickr users: allie in stitches, David Schroeter, Piper K, and puamelia -- thank you for allowing reuse (with attribution, noncommercial, no derivatives)! It makes my librarian heart happy!