I really love this board, read it everyday and learn something everyday. I never thought about thread getting old!! How old is old? 1 yr?, 5yrs? 10 yrs? Should all thread on wooden spools be thrown out? If it is considered too old to use in a machine could you still use it for hand sewing or is it even too rotten for this? Does some thread rot faster than others? I have my mother's stash of thread and a retired Home Ec teacher gave me bushels of thread. Thanks for any advice.