The national park offers a few facts about our role in driving climate change before the posts are removed from Twitter. A former employee was responsible for the tweets.

Cisco Systems Inc (CSCO.O) said on Tuesday that it agreed to buy U.S. business software company AppDynamics Inc for about $3.7 billion, making one of its largest deals of recent years as it searches for growth beyond its core networking business.

Everybody hates Wi-Fi. The boxes are ugly, and it never seems to work when you need it. But just when you thought wireless internet was unfixable, the most boring and hated appliance in your house may be on the verge of actually, um, working.

SAN FRANCISCO ? Sustainable energy evangelist Elon Musk ? whose Tesla brand is pushing to provide solar panels, home power storage and electric cars at affordable prices ? once told a group of students that relying on fossil fuels to power the planet would inevitably lead to destruction on a cataclysmic scale.