Sia's Handheld Mobile Device (image) Columbia University Caption Columbia engineering professor Sam Sia's handheld mobile device is a fast, low-cost device that uses the cloud to speed up diagnostic testing for HIV and more -- the mChip can easily be used in remote areas around the world. The mChip mobile device is on the left, with a satellite communication modem on the right. Credit Columbia Engineering Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.