Sometimes, walking away from a risky technology project is the better part of valor. Here are five handy rules for avoiding "ratholes."
Photography undergoes a sea change toward the intangible
Katharine Burr Blodgett's "invisible glass" helps us see.
Reviled in the '80s and forgotten in the '90s, the artificial heart is back and beating. TR readers get a rare glimpse inside the company that's developing it.
Michael Dertouzos and Bill Gates ponder open-source software and the future of the computing industry.