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Tech Q&A: How safe is it to use a tablet on a public Wi-Fi?

Q: When my apartment building added free Wi-Fi, I bought my first wireless device, a Kindle Fire tablet computer (my PC has a wired internet connection.) But I wonder what security software I should use on the tablet, and how concerned I should be that the building Wi-Fi network is very public – I don't even need a password to sign in. Should I be wary of using the Wi-Fi network for shopping and email?

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A flying car prototype from Silicon Valley

Kitty Hawk, a Silicon Valley company backed by Larry Page, a Google founder, began testing a prototype over a lake in Northern California.
New York Times
A flying car prototype from Silicon Valley 0:40

A flying car prototype from Silicon Valley

Moby microbe 1:25

Moby microbe

Mark Cuban: AT&T, Time Warner merger needed for competition with major tech companies 5:13

Mark Cuban: AT&T, Time Warner merger needed for competition with major tech companies

A laser-powered robot caterpillar 0:37

A laser-powered robot caterpillar