bs0d3 writes: The law that would have banned teachers from friending students on twitter and facebook was overturned late Friday. Now that a preliminary injunction has been issued to block the law in question from going into effect, the Missouri House subsequently passed a similar, but separate, bill with a 139 to 2 vote that gives school districts the freedom to determine their own communications policies. The new bill, which would permanently block the previously one, now awaits Governor Nixon's approval. Free speech advocates admit it's good that the first bill is gone but point out that the next one isn't much better.
We warn the reader in advance that the proof presented here depends on a
clever but highly unmotivated trick.
-- Howard Anton, "Elementary Linear Algebra"