If you can read this, our browser doesn't support iframes — click here for the site. The Vault is Slate's history blog. Like us on Facebook, follow us on Twitter @slatevault, and find us on Tumblr.
Balloon bombs aimed to be the silent assassins of World War II. Hitching a ride on a jet stream, these weapons from Japan could float soundlessly across the Pacific Ocean to their marks in North ...
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