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Welcome to Tech News Briefing and Happy Halloween!

It's Tuesday, October 31st.

I'm Zoe Thomas, für die Wall Street Journal.

You've probably heard the term biological clock.

But did you know yours could be ticking at a different speed from the calendar?

Scientists say your biological age could be a more accurate predictor of lifespan and age-related diseases.

And companies that test changes to your DNA are offering to give you a look at that magic number, and possibly help drive it down.

Our Medical Science reporter Dominique Mossberg and tried out tests from some of these companies,

initially with us to explain how they work and tell us about her results.

But first, Google CEO Sundar Pachai took the stand yesterday in the Tech Giants Anti-Trust trial.

His testimony is viewed by many observers as pivotal, since the case could result in major changes for the company's search engine.

For weeks, the government has called witnesses to make its case that Google's dominance in search is a result of its exclusive deals with Apple and other smartphone companies.

Our reporter Jan Wolfe was in the courtroom.

During the eighth week now of the landmark Anti-Trust case against Google here in Washington, D.C.,

much of the trial featured government witnesses, that is to say people put on a witness stand by the Justice Department and the bipartisan coalition of state attorneys generals that have joined in the DOJ's case,

and have also made some overlapping arguments of their own.

And the testimony from Google CEO did not produce bombshell revelations, but it did produce a encapsulation of the Google defense,

which is that people like us because we're the best.

...