404. That’s an error.
The requested URL /bookmarks/mark?op=add&bkmk=http%3A//science.sciencemag.org/content/early/2006/11/02/science.1134231&title=Probing%20the%20Chiroptical%20Response%20of%20a%20Single%20Molecule
was not found on this server. That’s all we know.