TECHNOLOGY BULLETIN.

The article offers news briefs on technology developments in the field of engineering. Raoul Kopelman, a chemist at the University of Michigan, developed a needle, a tiny sensor, which, he can stick into a single living cell, and the cell would not even notice. MD Explorer helicopter has been predicted as the first rotocraft of the 21st century by its maker, McDonnell Douglas Helicopter Co., for having a 20 minute maiden flight. In its design, the conventional exposed tail rotor has been eliminated and has been featured with the anti-torque and directional control technology. Ulrich Goesele, a Duke University professor has obtained glowing porous silicon, a material that--unlike normal silicon--converts electricity into visible light.