Suspicious letter addressed to US President Obama has tested positive for the deadly poison ricin, as did a letter to a Republican Senator.
The FBI assessment is that there are no links between the poison letters to Obama and Senator Roger Wicker and the bombs at The Boston Marathon.
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If you're worried your online social circle is thinning out, a new browser extension will let you know who cut you loose online.
The Russian government has launched a campaign urging people to take safer selfies after after high-risk poses resulted in dozens of deaths.