Table of Contents

Random Walk

Voyager Journeys to Interstellar Space
by Edward C. Stone
After 25 years, the two Voyager spacecraft will soon leave the bubble that the solar wind blows around the sun. But where, exactly, does the bubble end?

Swiss Rolls and Oreo Cookies
by Sossina M. Haile
Fuel cells will make the future greener, and power packs running on lighter fluid may one day be in all our pockets.

The Chief Technologist's Mechanical Advantage
by Douglas L. Smith
JPL explores the solar system for NASA, and Caltech mechanical engineer Erik Antonsson scouts the technological frontier for JPL.


Obituaries: Jesse Greenstein; Wheeler North; William Sears

Faculty File