Table of Contents

Random Walk

When Will We Find the Extraterrestrials?
by Seth Shostak
Are we alone in the vastness of the universe? If not, where is everbody? A Caltech alumnus looks for E.T.

A Toymaker's Lab
by Marcus Y. Woo
Innovative techniques and gadgets may change how biologists do research and how doctors diagnose and treat diseases.

Spitzer Warms to the Task
by Whitney Calvin
As the Spitzer Space Telescope embarks on its "warm mission," we look back on some of its achievements so far.

Say Hello to Your Little Friends
by Marcus Y. Woo
Not all bacteria make you sick. In fact, some may be crucial for your health.


Obituary: Thomas C. McGill

Faculty File