Apple Mail offers controls for parents to monitor their kids' email usage, including the capability to add specific senders to a whitelist. However, Jonathan Kamens has discovered a fairly simple means by which a nefarious individual can trick Mail into automatically adding any address to the whitelist. Kamens says he reported the flaw to Apple back in June, but adds that the company has neither fixed the problem nor treated it as a security vulnerability. Fortunately for concerned parents, Kamens lays out a pair of stopgap workarounds.

Garmin is voluntarily recalling about 1.25 million n├╝vi GPS devices, nearly 800,000 of which were sold in the United States. The recall is to address a problem with the battery that could cause the device to overheat and become a fire hazard. Affected units include the n├╝vi 200W, 250W, 260W, and 7xx (where xx is a two-digit number), though apparently not the 255W we reviewed in 2008. Fewer than 10 cases of overheating have been identified, but Garmin will replace the battery and insert a spacer before returning your GPS, free of charge.

Don't get too paranoid about this, but security researchers at the University of Pennsylvania have shown than Android graphical passwords can be recovered by photographing the screen of a smartphone and analyzing the smudge patterns. There isn't much likelihood of this attack being used widely, because its utility requires either gaining control of the smartphone or the same password being used elsewhere, and the screen can easily be cleaned. But it's still interesting just where security vulnerabilities will be found.

On the New York Times's health blog, Gretchen Reynolds discusses the dramatic increase in heart disease-related death for folks who sit for long periods (whether in front of a computer or television, or in the car). Even more alarming for those of us who try to get away from our screens for some exercise are recent studies that show that adding exercise to your daily routine fails to lessen the negative health impacts of a sedentary lifestyle. Rather, we desk jockeys should find ways to increase our physical activity while we work. Frequent walking breaks, pacing while you're talking on the phone, or converting to a standing desk, could truly be a lifesaver.