What s in the barrel?

What s in the barrel? how does one identify the contents of an unmarked drum? Several researchers have tried to do so, but it has never been easy. Either the process is cumbersome, unaffordable or unreliable. Now a team at the Los Alamos National Laboratory in New Mexico has come up with a "sound gun' that will easily tell the difference between a fuel drum and a barrel of nerve gas.

The team says the

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