Long before the era of post-Sept. 11 security precautions in the U.S., an unknown person or group of people may have begun carrying out a series of bioterrorism attacks in California.
The target? Menthol-scented eucalyptus trees.
Before you wonder why you hadn't heard of this, it's because the story isn't necessarily true. It's a hypothesis, a theory promoted by a noted California entomologist and eucalyptus expert named Timothy Paine.
If his theory is correct, then somebody out there wants those trees dead.