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Version B

We predicted that Version A would be the clear winner since it had a photo to captivate visitors and a "free" product call-out. However, the data from the tests showed that the cleaner, simpler Version B was more effective. In fact, the changes in Version B increased downloads by 30%! This example illustrates a powerful point: sometimes you need to rely on data — not your gut — to make decisions that will help your website and your bottom line.

Now, you might be asking yourself, "With so many different aspects of my website to test, how do I know where to begin?" Here are four design tips to pay attention to:
  • Tip #1: Pass the 8 second test. At first glance, a visitor should understand the purpose of your website within a few seconds. People are busy and have limited attention spans — you want to keep them from hitting the dreaded back button.
  • Tip #2: Tell them what's in it for them. Create clear and tangible benefits (e.g., "Save more! Make extra money! Look better with our product!").
  • Tip #3: Use compelling images. Try product images instead of generic stock photos, icons with blocks of text, and buttons instead of links. Keep in mind that a low-quality, irrelevant image can kill your site's credibility.
  • Tip #4: Close the sale. Help your visitors take the next step. Make that step clear and easy to reach; don't make them hunt for it. Action words like "buy now" may work better than "add to cart," for instance.
Once you've decided which details to test — a call-to-action, color, headline, layout, or video, for example — go to Website Optimizer and set up an experiment. For first-time users, we recommend a/b testing, meaning testing one variation of your page against another. After you launch your experiment, Website Optimizer will do the heavy lifting and show you when the data is "statistically significant." (In case it's been a while since your last Stats 101 course, statistical significance means that an event is unlikely to have happened by chance, and that you have enough data to know that there is a true difference in which page variation your visitors prefer.) The results will start showing in your reports page and for each experiment, the corresponding bar will begin to turn red, yellow or green. When the bars start to turn green, you have a winning page variation that is helping you reach the goals you have set for your website:


Remember, best practices may work best for some, but they are not necessarily what's best for your site and your visitors. In the past, a few opinions and a strong hunch determined an effective website design. Now, armed with metrics, data, and tools galore, you can let your visitors tell you what works best for them and for your site.

Good luck, and get testing!


A combination of translation error and overactive imaginations caused some of Schiaparelli's contemporaries, including astronomer Percival Lowell, to re-label these features as canals, suggesting that Mars was home to both an advanced Martian civilization and abundant water bodies.

Of course, further study of Mars has revealed neither water bodies nor any signs of intelligent life on the planet, and Schiaparelli's 'canali' were shown to be nothing more than an optical illusion. Yet, our study of the planet has only increased, and our curiosity has only deepened, as countless images and numerous space missions have been dedicated to the Red Planet since Schiaparelli's time.

But don't just take my word for it. Instead, you can fly all the way there yourself with Mars in Google Earth 5.0.


New features released on Friday give you a glimpse into the evolution of our knowledge of Mars over the course of history. You can travel back in time to see the sketches of early astronomers like Schiaparelli and Percival Lowell in the 'Historical Maps' layer. You can also fast-forward more than a century with the 'Live from Mars' layer to view the latest images from NASA's THEMIS camera on board the Mars Odyssey spacecraft, sometimes just hours after NASA receives them. Bill Nye the Science Guy and Public Radio's Ira Flatow, host of Science Friday, have also recorded narrated tours of Mars — together they'll walk you through some of the most interesting geology in the solar system and show off mankind's most advanced robotic planetary explorers.

For more information about the new features added to Mars in Google Earth, check out the Google LatLong Blog, or view the tutorial video below. To explore Mars on your own, download Google Earth 5.0.



Posted by Noel Gorelick, Chief Extraterrestrial Observer