August 25, 2006Scientists use aquatic robots and highly sensitive sonar to study its pristine, self-contained ecology. Photos: A water-filled crater Video: Deep-diving robotTAGS:lake, scientist, robot, sonar, water, professor, sign, researcher, video
Amaze, astound, and stupefy family and friends with this numeric magic trick. The application doesn't reveal their secret number, but you...TAGS:sonar, trick, card, instruction