via mashable.com
Some of the hottest tech trends of 2012, like mobile apps and solar energy, are changing the world for the better. This year, we saw a variety of inspiring innovations tackle some of the world's greatest challenges.
We've seen iPods help dementia patients, Android phones monitor carbon offsets and mobile apps prevent texting while driving.
From homelessness to electricity access, government accountability to deforestation, there are few problems tech can't address.
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