President Clinton took office in 1993 and lifted that ban, but in 1994 he ceded some ground to the anti-stem-cell crowd by blocking the use of federal money to create embryos for research.

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So far, the GOP leadership has been successful at blocking anti-war legislation because Democrats don't have the 60 votes to cut off what would become an endless debate on the war.

NPR: Senate Democrats Push for All-Night Debate on Iraq

But the anti-pipeline crowd is wrong in thinking that blocking Keystone XL will somehow stop development of the oil sands.

FORBES: Come On Already, Let's Build Keystone XL

An anti-collusion rule forbids participants from strategizing together and blocking less experienced players.

FORBES: David Vs. Goliath

On July 5th, South Africa's highest court ordered the government to stop blocking the universal provision of an anti-AIDS drug at public hospitals to prevent the disease being transmitted from mothers to children.

ECONOMIST: The menace of AIDS | The

Some experimental anti-Alzheimer's drugs aim to arrest the disease by blocking amyloid buildup.

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With fixes to ensure the legislation only targets rogue websites and does not create unintended problems by requiring actual website blocking or traffic filtering, support for online anti-piracy legislation is likely to strongly consolidate as the bills progress, enabling it to become law in this Congressional session.

FORBES: SOPA Opponents' Bogus Net Neutrality Comparisons

For instance, Mr. Flint says, most anti-frizz products over the past 30 years contained silicone, which is ineffective at blocking out humidity.

WSJ: How I Built It: Lawyer Takes On Beauty Care