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The waning black crescent is all that remains from an Escherichia coli sample. "If it could scream, it would," says University of Iowa microbiologist John Kirby, who led a recent study on bacteria behavior. The E. coli has fallen victim to Myxococcus xanthus, a type of bacteria that forms unique rippling waves as it feasts on other bacteria. During an attack, M. xanthus secretes enzymes to break down E. coli, and then each bacterium moves back and forth like a vacuum cleaner to suck up its food.

As time goes on, more and more people are carrying little cameras with them everywhere they go. I'm one of them. Here are a few camera tricks I've picked up through the years.

We are happy to announce the latest winner of PopSci's rolling reader photo contest: Owen Wolter.

The theme for the next contest is Spooky Science -- let's see what you've got! Upload your entries to our Flickr pool

Another awesome set of entries to the PopSci photo contest. Thanks to everyone who entered and congrats to this week's winner for the theme "Science Up Close": Freshdopetea (via our Flickr pool).

For all of you photogs, another contest is in the works. After the jump, get the low down. And as always, happy shooting!

The Winning Entry: Sea Nettle Jellyfish:  Piper vonSederholm

The first contest was such a hit, we're rolling out another. This week's theme: The Man-Made World. Drop your best shots into the pool. Full rules (and more info about Piper's photo), after the jump.

Photographers! We want to feature your work on PopSci.com. Upload your photos, and the editors' pick will be highlighted on the site, along with a short profile of the photographer. Our first contest’s theme is "The Art of Science" (which leaves you plenty of room for interpretation) and our winner will be chosen on Friday, August 8, 2008.

In each issue of Popular Science, our renowned What's New section keeps you up to date with the most innovative consumer products currently on the market. Here on PopSci.com, we bring you a special expanded edition of "The Goods," college-style. Click "View Photos" at left to launch the gallery.

Our largest collection of the best sci-tech images around. Click "View Photos" to launch the gallery.

PopSci presents over 90 pages of the season's hottest tech: Everything from phones, speakers and cameras to yes, even vacuums.

To launch the gallery, click "View Photos"

It is with a heavy heart that we bring you this special weekend report. When PopSci's Wii arrived last week, it didn't spend too much time in the box. Ripped open without any hesitation, our little Wii gave us a long Friday's worth of furious Wii Sports and Excite Truck action at PopSci HQ.

If you're anything like us, you were the type of kid who took apart dad's
new radio just to see what was inside. That kind of curiosity never dies,
which is why How 2.0, PopSci's award-winning home for the coolest
tips, tricks, hacks and do-it-yourself projects, wants to see what today's
tech tinkerers are up to.

Have you built something amazing you'd like to
show off? Tried a How 2.0 project and failed miserably? Blown something up
with the kids' chemistry set? If you've invented it, tweaked it, hacked it,

Leaning from a low-flying helicopter to shoot a fast-moving military boat. Zooming in on a tiny bee equipped with a radio transmitter. Feeling the heat while snapping a car explosion just meters away. These are a few of the adventurous scenarios John B. Carnett has found himself in while on assignment for Popular Science.

With this SD (Secure Digital) flash-memory card, you can move photos, songs or any other files from your device to your computer without cables or a separate card reader. Just stick the built-in USB plug directly into your computer. $80 (512MB) or $135 (1GB)

A: Tagging is the act of assigning your own keywords to things online-photos, blog entries, bookmarks-so that you can easily categorize, locate, and share them in the future. One of the best examples is del.icio.us, which lets you save Web bookmarks to a page on the site instead of to a file stashed away on your computer. This way, you can access them from anywhere and let other people see what sites you like.