slight decline in the use of key surveillance powers. In 2014 an estimated 227 Americans were the subject of searches of business records permitted under Section 215, down from an estimated 248 in 2013, though the collection of those records often affects many more.

The defense secretary, Ashton Carter, who presides over the NSA and US Cyber Command, will deliver an address to Stanford University on Thursday that is described as an effort to mend ties with Silicon Valley, even as defense officials conceded the NSA played a large role in crafting the cybersecurity strategy that Carter will discuss.

Yet significant divides remain on surveillance between the administration and the privacy and tech communities, many of whose members consider a cybersecurity bill passed on Wednesday by the House with tentativeOn a remote Pacific island not much bigger than Manhattan, there are ancient pyramids built out of living coral. New evidence reveals that these tombs could be up to 700 years old — much older than experts had previously thought.

The royal tombs are tucked away in an artificially built ancient city called Leluh just off the mainland of Kosrae, a Micronesian island. Leluh was home to Kosraean high chiefs (as well as some lower chiefs and commoners, too) from about 1250 until the mid-1800s, when foreign whalers, traders and missionaries started to arrive on the island.

With impressive canals and walled compounds built from basalt, Leluh is often considered a companion city to the more famous Micronesian settlement of Nan Madol, on the nearby island of Pohnpei. While the