Questions of Today

1. Why don't we floss with thread? Why do we spend more on dental floss?
2. Do termites eat through wood in a certain pattern? If so, is that pattern more conducive to the decomposing of the wood? If they were to, say, eat only in straight lines, would that weaken the wood more? Or is what they do now more destructive?

These are my deep ponderings for today.