Gum is an effective booster of mental performance, conferring all sorts of benefits without any side effects. The latest investigation of gum chewing comes from a team of psychologists at St. Lawrence University. The experiment went like this: 159 students were given a battery of demanding cognitive tasks, such as repeating random numbers backward and solving difficult logic puzzles. Half of the subjects chewed gum (sugar-free and sugar-added) while the other half were given nothing. Here’s where things get peculiar: Those randomly assigned to the gum-chewing condition significantly outperformed those in the control condition on five out of six tests. (The one exception was verbal fluency, in which subjects were asked to name as many words as possible from a given category, such as “animals.”) The sugar content of the gum had no effect on test performance.

While previous studies achieved similar results — chewing gum is often a better test aid than caffeine — this latest research investigated the time course of the gum advantage. It turns out to be rather short lived, as gum chewers only showed an increase in performance during the first 20 minutes of testing. After that, they performed identically to non-chewers.

What’s responsible for this mental boost? Nobody really knows. It doesn’t appear to depend on glucose, since sugar-free gum generated the same benefits. Instead, the researchers propose that gum enhances performance due to “mastication-induced arousal.” The act of chewing, in other words, wakes us up, ensuring that we are fully focused on the task at hand. Unfortunately, this boost is fleeting. The takeaway of this research is straightforward: When taking a test, save the gum for the hardest part, or for those questions when you feel your focus flagging. The gum will help you concentrate, but the help won’t last long.

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Page Speed Service is the latest tool in Google’s arsenal to help speed up the web. This service is also their most ambitious yet. When you sign up and point your site’s DNS entry to Google, they’ll enable the tool which will fetch your content from your servers, rewrite your webpages, and serve them up from Google’s own servers around the world. Yes, you read all of that correctly.

“Your users will continue to access your site just as they did before, only with faster load times,” Google notes. They say that applying web performance best practices across these pages should improve speed by 25 to 60 percent. Google will allow you to test out how much they’ll be able to speed up your site before you commit to it, apparently.

I applied to try it out. It's a rough world -- this is pretty much what CloudFlare does.