Worth a thousand words. A selection of some of our favorite art from the past 15 years.

Happy 15th, ScienceNOW!

David is the Online News Editor of Science.

It’s not easy getting older, but this is one birthday we’re happy to celebrate. Tomorrow, ScienceNOW, Science’s daily online news site, turns 15. ScienceNOW was one of the first science news sites on the Web, and over the past decade-and-a-half we’ve brought you the biggest and most bizarre science stories out there. Here are a few of our favorites. If you’ve got one of your own, let us know in the comments section!

Perhaps not surprisingly, given that ScienceNOW launched in the second week of October, our first ever story was about the Nobel Prize. Peter Doherty and Rolf Zinkernagel took home the physiology or medicine honor that year for their insights into the inner workings of the human immune system. And that was just the beginning of our coverage of the biggest breakthroughs, from the cloning of Dolly the sheep, to the first sighting of an alien world, to the discovery of a new type of cell called a “stem cell.”

Looking back, we were reminded of the salad days when Pluto was still a planet and the world’s fastest computer performed 1 trillion mathematical operations per second (today’s champ is 8000 times speedier). And we noticed that some stories keep coming back in the news, from political battles over climate change, to fears of human cloning, to claims of life on Mars.

And, of course it wouldn’t be ScienceNOW without some bizarre headlines (“The Elvis of E. coli,” “The Upside of Diarrhea”, “A Little Fellatio Goes a Long Way”), odd creatures (“Slug Sex Shocker,” “Mongoose Nannies From Hell,” “Ants on Stilts”), and far-out ideas (“Why Only Three Dimensions?,” “Does Our Universe Live Inside a Wormhole?,” "Tiny 'Flying Saucers' Could Save Earth From Global Warming”).

Thanks for your readership and comments over the past 15 years, and here’s to the future!

ScienceNow at 15
That’s a mouthful. A word cloud of our most popular terms over the years.