The technique requires only tiny quantities of material, and it can probe a living cell without doing it harm.

FORBES: A hail of silver bullets

Cole told Issa the department has handed over 7, 600 pages of material related to the botched probe, and Holder has testified about the issue seven times.

CNN: House committee weighs Holder contempt resolution

Academics are increasingly using new technologies at their disposal to search for innovative ways of investigating historical material to enable us to probe new questions and find alternative patterns of investigation.

ENGADGET: British Library and Google Books partner up to digitize 250,000 out-of-copyright works

He said he would push to get access to any material he considers essential for the House probe.

CNN: White House, Burton Agree On Documents

Lawyers representing Clemens in the civil case had sought to withhold more than 1, 600 pages of documents from the government's criminal probe on the basis that they were grand jury material.

WSJ: Roger Clemens still dogged by NY steroids case

The U.S.-led probe into the attacks has detained 80 people for questioning and has four people under arrest as material witnesses.

CNN: Ashcroft: Terrorists likely received support from other governments