Counting Heads: Accurately Estimate a Crowd's Size

You Saw What in ‘Avatar’? Pass Those Glasses!
Record-breaking crowds have seen James Cameron’s epic, and the list of those who saw cause for protest is growing.

How-To Wiki: Estimate the Height of Tall Objects
Determining the height of tall objects from a glance doesn't require a prohibitively large tape measure -- just a little math, a sharp eye and a protractor.

Baidu CEO draws crowd in Google’s backyard
The billionaire founder of a search engine drew a big crowd at Stanford University — and it wasn't one of the guys that started Google just a few miles from the campus they once attended. ...

Teaming with Microbes: A Gardener's Guide to the Soil...
Smart gardeners know that soil is anything but an inert substance. Healthy soil is teeming with life-not just earthworms and insects, but a staggering multitude of bacteria, fungi, and other...

Biomaterials Science, Second Edition: An Introduction...
The second edition of this bestselling title provides the most up-to-date comprehensive review of all aspects of biomaterials science by providing a balanced, insightful approach to learning...