If you want to stay heart healthy, you should exercise, eat right, not smoke, and… stay away from iPads? As Bloomberg reports, 14-year-old Gianna Chien has discovered that the 30 magnets in the iPad 2, which are used to hold the Smart Cover in place, could accidentally disable a pacemaker if the user falls asleep with the iPad on his or her chest. Apple warns of this danger on page 126 of the iPad User Guide, but how many of you read that far? Chien made the discovery while working on a science fair project, which sadly didn’t win first place. (We hope the media coverage of her project helps makes up for that!)

Despite recent complaints about iOS security, it’s effective against at least one group: law enforcement. According to Declan McCullagh at CNET, police departments around the country are sufficiently stymied by iOS device encryption that they’re turning to Apple for help. They’ve flooded Apple with so many requests for assistance decrypting confiscated iPhones that Apple is putting them on a waiting list of up to 4 months. Of course, the flip side of this story is the suggestion that Apple has a backdoor method of cracking iPhone encryption.

Kara Swisher of AllThingsD.com reports that LivingSocial, a daily deals site owned in part by Amazon, has suffered a massive data breach involving the names, email addresses, birth dates, and encrypted passwords of 50 million customers. No credit card or financial information was lost, luckily, but this is just another example of why it’s essential to create a different strong password for every Web site and Internet service. Read Joe Kissell’s “Take Control of Your Passwords” for a complete password strategy.

Flashback was one of the most significant pieces of malware to affect Mac OS X, morphing quickly and infecting more than 650,000 Macs. Security writer Brian Krebs has now identified a 30-year-old Russian man as being responsible for Flashback. It seems unlikely this outing will make any significant difference in the guy’s behavior, but it’s interesting to have the human element brought into malware coverage.

Should security practices be kept secret? The Verge’s Tim Carmody suggests that Apple’s legendary secretiveness could result in worse security than if the company were more transparent about how it protects customer data. He closes with, “All the evidence suggests that much like Apple Maps or MobileMe, iCloud simply isn’t at the level of polish and performance we’ve come to expect from Apple. Security is just a symptom.”

According to Russian security firm Doctor Web, there are an increasing number of Mac-focused Trojans that install extensions for Safari, Chrome, and Firefox. These extensions are designed to embed third-party ad code into otherwise unrelated Web pages, funneling the clickthrough revenue back to the malware authors. The Trojans use a variety of techniques to fool users into installation, including masquerading as video plug-ins, media players, download accelerators, and more. To be safe, avoid installing software from sites that prompt you to do so — always get software from trusted sources.