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"Human beings hardly ever learn from the experience of others. They learn; when they do, which isn't often, on their own, the hard way."
- Robert Heinlein

Crackers  
  Bouncing, explosive mines.  

The "bumblebees" are alien soldiers chasing the troops. The men retreated down the tunnel in good order, strewing pill-mines and the new human-Revain "crackers" as they went. Before they had gone a hundred yards, there was a livid flash and a brittle explosion. He caught a glimpse of three bumblebees being flung backward in gruesome pieces; behind them, however, the tunnel was packed with the things. A cracker started up, bouncing from roof to floor with each detonation and leaving wide gaps in the black, tightly packed ranks.
From The Time Mercenaries, by Philip E. High.
Published by Ace in 1968
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