The large "W+" in the Washington Hospital signage in 'Dream Logic' is shorthand for the W (weak force) boson. Weak bosons, a theoretical product of weak interaction and positron emission, foreshadows the condition of the ill cosmonaut in 'Earthling'.
The patient record for 'CARSON, D' in 'Earthling' foreshadows Dr. Carson's involvement in the cloning experiments in 'Of Human Action'.
FRINGE DIVISION CASE FILE #206-11509
FRINGE EVENT: Humans spontaneously turned to ash
CLASSIFIED CASE CONNECTION(S): Kidnapping of Russian cosmonaut Aleks Vasiliev
AGENTS ASSIGNED: Dunham
SUPERVISING AGENT: Broyles
FILE ARCHIVED BY: Brad Williams, Anastasis Alepis
LOCATION: Boston, MA; Latchmere General Hospital
VICTIM(S): Randy Rancik (deceased), John Doe patient (deceased), Nurse Maxine [redacted], Aleks Vasiliev (unknown), Timur Vasiliev (deceased)
CASE REPORT SUMMARY:*Highly classified—security access 7 and above*
WALTER: "Titanium tetrachloride, you sly temptress."