This is "Healthy Tech," where guest columnist Alan Danzis reports on choice healthy technology news stories. Each week you'll discover new fitness gadgets, apps and going-ons, as well as what's around the corner, with medical innovations that will one day change the way you monitor and impact your overall health and well-being. In this week's edition of Healthy Tech: walking can help burn calories and charge your phone, too, when you add a 24-year-old inventor's tech to the shoe soles; a mobile start-up proves that pretty much no one in the entire world is eating healthy at 1 A.M.; and one company gets millions in venture capital to help you the perform self-tracking of serious medical ailments at home.

A study from the Harvard School of Public Health suggested that yogurt is the food that does the best job at preventing age-related weight gain. To figure out what the deal was, researchers at MIT fed a bunch of yogurt to mice to see what would happen, and when the scientists say that their results were "entertaining," you know they've come up with something good.

The Universe is mostly dark matter. Dark matter, in fact, is all over the place, and there's five times as much of it out there as there is regular matter. We have no idea what dark matter is, but there's one thing that we are pretty sure of: some of this mystery stuff is smacking into you once every 10 seconds. You may now start to panic.

Straddling the border of north central Virginia and southeastern West Virginia is a 13,000-square-mile mountainous region known as the United States National Radio Quiet Zone. To protect the clutch of radio telescopes located within its borders from radio interference, the federal government highly regulates wireless technology, which means no cellphones and few Wi-Fi hotspots. Sleepy towns within this quiet zone might soon be invaded by folks trying to escape the onslaught of wireless technologies. You see, not only are cellphones suspected (emphasis on suspected) of causing cancer, but some scientists are now claiming Wi-Fi should be seen as a health hazard. But there are equally vociferous scientists who say all these Wi-Fi Chicken Littles are foolish fowl. So, is Wi-Fi harmful to you? This is an imponderable on the level of asking if animals have souls, or why we park in a driveway but drive on a parkway, or Coke or Pepsi. Of course, I have all the answers.