Trovan belongs to a category of powerful antibiotics called quinolones, which have the ability to penetrate tissues to kill bacteria.
The 95 B-52's are all over thirty years old, and their ability to penetrate modern air defenses is very doubtful.
Terahertz waves are known for their ability to penetrate materials without damaging them, and have in recent years been added to the suite of tools used to examine items of cultural heritage.
The problem is--assuming the F-35 sees the light of day in a timely manner--that this aircraft simply doesn't do the job in air-to-air combat that the F-22 does, nor does it have the F22's ability to penetrate sophisticated defenses.
"The FBI's ability to proactively penetrate and disrupt terrorist plans and groups prior to an attack would be impacted, " said an attachment to Mueller's letter.
The first version had a back made of metal, which hampered the ability of wireless signals to penetrate to the antenna inside, engineers said.
Given the persistent problems that may compromise the future ability of the B-1 to penetrate those defenses and the uncertain political fate of the B-2 bomber, retaining the right to deploy a sizeable and technologically competitive U.S. air-launched cruise missile force is imperative.
As this story could have revealed "sources and methods" that might affect the future ability of the CIA or of "liaison services" working with the agency to penetrate al Qaeda in Yemen again, the precise source of this leak seems to be the most legitimate avenue of inquiry for the Justice Department and the FBI.
But a product's SPF indicates only its ability to defend against sunburn-causing ultraviolet-B rays and not against ultraviolet-A, which penetrate deeper into the skin and cause premature aging. (Both types contribute to skin cancer.) For example, a person wearing SPF 50 could spend considerable time in the sun without getting burned.
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