Microsoft and U.S. carrier partner Verizon Wireless have never revealed how many KINs were purchased during that short period.

FORBES: Microsoft KIN Phone Makes Magazine Appearance Months After Discontinuation

While government announcements of Chavez's trips to Cuba for treatment were common, officials never revealed details about his prognosis or specified what kind of cancer he had.

CNN: March 13, 2013 -- Updated 0243 GMT (1043 HKT)

Curator David Hodges revealed that, although staff knew the boots were there, they never knew who they belonged to.

BBC: Sir Stanley Matthews wore Hitchin Museum's mystery boots

The calling patterns from 600 towns revealed that the two groups almost never talked to each other, even when they were neighbors.

WSJ: The Really Smart Phone