PA's most effective weapon would be incontrovertible signs that it is bringing violence under control.

ECONOMIST: Israel and Palestine

Because Moore keeps little secret, exposure is not an effective weapon against him.

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The McCain campaign is also continuing to wield its most effective weapon in the battle for women voters, Sarah Palin.

NPR: Candidates Vie For Female Voters' Attention

For all the palaver from politicians and private foundations about the need to eradicate the ghastly and often deadly disease of malaria, health officials still won't vigorously employ the most effective weapon against it: DDT.

FORBES: Fact and Comment

What happens if they do develop an effective nuclear weapon?

CNN: What's Kim Jong Un's intention with the nuclear test?

In limited-overs matches, this has the effect of also making it a more effective defensive weapon: Many batsmen are less confident against spin bowling, which makes them less bold in attack.

WSJ: Why Test Cricket Is All In a Spin

At last an effective troll-busting weapon is to hand: Facebook.

ECONOMIST: Digital identities: Trolling for your soul | The

But experts say it is more effective on individuals than as a weapon of mass destruction.

CNN: Ricin scare rattles Washington

Shields, a Tampa Bay Rays starter, grew up believing that a pitcher with an effective pickoff move has an extra weapon at his disposal.

WSJ: Derek Jeter's Jump Throw, Adrian Beltre's One-Knee Home Run, Robinson Cano's Cross-Body Throw, James Shields's Crouching Pickoff Move: Baseball's Signature Moves

The key is the elimination of the mosquito, but fundamental shortcomings in public policy have made unavailable the most potent weapon in our arsenal: DDT, an inexpensive and effective pesticide once widely deployed to kill disease-carrying insects.

FORBES: Beyond Copenhagen