Eating paper & a homeschool morning

Why does my seven-month-old love to chew paper? Is she lacking sufficient cellulose in her diet? She delights in sitting on my lap and pulling papers out of the desk drawer so she can chew on them. Just now, she creeped (mostly backwards, as she hasn't figured out forward motion yet) around my chair and under the low table beside me, where she is happily trilling as she--oops, never mind, she just bumped her head and the happy trills are gone--seeks new paper and plastic toys to stick into her mouth. I have soggy, ragged pieces of paper all around my feet.

Dd2 is playing with her Duplo blocks and zoo animals. Dd5 was just climbing on a bench to get into my "off-limits-to-the-toddler" shelf and came down with a pencil compass, which she announced she will use to make circles. Dd7 is playing with a tricky/magic worm instead of reading about the human body in her Core Knowledge book like she's supposed to be doing. Dd10 is reading from the encyclopedia about the Punic Wars and narrating to me the main idea of each paragraph.