Sleuths Read Old Booby-Trapped Letters Without Opening Them

Sleuths Read Old Booby-Trapped Letters Without Opening Them

  • Höfundur
  • Episode
      1499
  • Published
      11 mars 2021
  • Útgefandi
0 Umsagnir
0
Episode
1499 of 2360
Lengd
12Mín.
Tungumál
enska
Gerð
Flokkur
Óskáldað efni

People once folded their correspondence in intricate ways, known as “letterlocking,” to keep out snoops. A fancy new imaging technique sees right through it.

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