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U.S. troops participating in sarin gas and VX nerve agent training. The toxin used in the Salisbury, U.K., attack is up to 10 times more potent than VX. Photo: Leif Skoogfors / Corbis via Getty Images

The Novichok or N-series nerve agent — used in last week’s attack against Russian ex-spy Sergei Skripal and his daughter Yulia in Salisbury, U.K. — is distinct from the better known G- and V-series nerve agents, which unfortunately have become more familiar after their use in Syria and by terrorist groups.

How it works: Nerve agents interfere with neurotransmitters, causing involuntary muscle contractions, impaired cardiac function and airway restriction, potentially culminating in death by asphyxiation. They interfere with the nervous system in stages, making rapid decontamination and treatment essential.

Novichok is up to 10 times more potent than the VX that was used to kill the half-brother of North Korean leader Kim Jong-un last year. It can penetrate NATO chemical protective gear and was specifically designed to be undetectable using NATO and U.K. sensors.

The bottom line: The use of Novichok represents a deadly game-changer for chemical warfare and nonproliferation. It demands global condemnation and an insistence that Russia account for how the nerve agent came to be used at all, much less on foreign soil.

Daniel M. Gerstein, a senior policy researcher at the RAND Corporation and adjunct professor at American University, was formerly the acting undersecretary for Science and Technology at the Department of Homeland Security.

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Technical glitch in Facebook's ad tools creates political firestorm

Facebook CEO Mark Zuckerberg. Photo: SOPA Images / Contributor

Facebook said late Thursday that a mix of "technical problems" and confusion among advertisers around its new political ad ban rules caused issues affecting ad campaigns of both parties.

Why it matters: A report out Thursday morning suggested the ad tools were causing campaign ads, even those that adhered to Facebook's new rules, to be paused. Very quickly, political campaigners began asserting the tech giant was enforcing policies in a way that was biased against their campaigns.

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States beg for Warp Speed billions

A COVID-19 drive-thru testing center yesterday at Hard Rock Stadium in Miami Gardens. Photo: David Santiago/Miami Herald via AP

Operation Warp Speed has an Achilles' heel: States need billions to distribute vaccines — and many say they don't have the cash.

Why it matters: The first emergency use authorization could come as soon as next month, but vaccines require funding for workers, shipping and handling, and for reserving spaces for vaccination sites.