As medical researchers and engineers try to shrink diagnostics to fit in a person's pocket, one question is how to easily move and mix small samples of liquid.

ZHENGZHOU, China, May 9, 2012 /PRNewswire-Asia-FirstCall/ -- China Valves Technology, Inc.

Whether people are building a flying machine or nature is evolving one, there is pressure to optimize efficiency. A new analysis by biologists, physicists, and engineers at Brown University reveals the subtle but important degree to which that pressure has literally shaped the flapping wings of bats.

The coupled normal mode method is a powerful approach for solving range-dependent propagation problems in underwater acoustics.

Stir lots of small particles into water, and the resulting thick mixture appears highly viscous.