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Beneath the streets of hundreds of North America's oldest cities lies a network of pipes delivering steam heat to office buildings and hospitals. These steam loops could be a clean energy solution.

Beneath the streets of hundreds of North America's oldest cities lies a network of pipes delivering steam heat to office buildings and hospitals. These steam loops could be a clean energy solution.

Donald Trump spent this week campaigning in states with upcoming primaries. The presumptive GOP nominee has been strengthening elements of his campaign. But his tone remains the same.

The Senate appears headed for a clash that will fundamentally change how the institution approaches the process of Supreme Court nominations, and it could have further implications.

An admiral in charge of Iran's 'Northern Navy' said 'fleets' are already making way for Atlantic waters, but he did not say the number or type of vessels.

One of China's most valuable tech startups, smartphone maker Xiaomi, is getting into networked appliances, in a bid to innovate its way out of trouble, as its core business falls flat.

So far, the fighting has stayed in Hodeidah's outskirts. But the relative calm isn't likely to last — and aid groups are desperately calling for its port to stay open for a country already in crisis.

There has been a large turnout for hundreds of town hall debates across France, called by President Emmanuel Macron in an effort to diffuse social tensions amid the yellow vest protests.

The five covers feature the company's heroes — including Spiderman, Iron Man, and the Hulk — all engaging in activities educators have been trying to promote.

Oil production in the U.S. is booming, and that's making it harder to get crude oil from the field to the refinery. With pipelines filled to capacity, energy firms are turning to rail networks.