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GW170817 is a gravitational wave signal observed by the LIGO/Virgo collaboration on 17 August 2017, and is the first gravitational wave event that was observed to have a simultaneous electromagnetic signal, thereby marking a significant breakthrough for multi-messenger astronomy. The gravitational wave signal, which had a duration of approximately 100 seconds, is the first gravitational wave detection of the merger of two neutron stars, and was associated with a soft short gamma-ray burst GRB 170817A, and an optical transient that was found in the galaxy NGC 4993.No neutrino candidates consist
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ent with the source were found in follow-up searches.

The event was officially announced on 16 October 2017 at press conferences at the National Press Club in Washington, D.C. and at the ESO headquarters in Garching bei München in Germany.

The first public information about the event was tweeted by astronomer J. Craig Wheeler of the University of Texas at Austin on 18 August 2017. He later deleted the tweet and apologized for scooping the official announcement protocol. Other people followed up on the rumor, and reported that the public logs of several major telescopes listed priority interruptions in order to observe NGC 4993, a galaxy 40 Mpc (130 Mly) away in the Hydra constellation.[The collaboration had earlier declined to comment on the rumors, not adding to a previous announcement that there were several triggers under analysis.
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What is DragonFly BSD?

DragonFly belongs to the same class of operating systems as other BSD-derived systems and Linux. It is based on the same UNIX ideals and APIs and shares ancestor code with other BSD operating systems. DragonFly provides an opportunity for the BSD base to grow in an entirely different direction from the one taken in the FreeBSD, NetBSD, and OpenBSD series.

DragonFly includes many useful features that differentiate it from other operating systems in the same class.

The most prominent one is HAMMER, our modern high performance filesystem with built-in mirroring and
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historic access functionality.

Virtual kernels provide the ability to run a full-blown kernel as a user process for the purpose of managing resources or for accelerated kernel development and debugging.

The kernel uses several synchronization and locking mechanisms for SMP. Much of the work done since the project began has been in this area. A combination of intentional simplification of certain classes of locks to make more expansive subsystems less prone to deadlocks, and the rewriting of nearly all the original codebase using algorithms designed specifically with SMP in mind, has resulted in an extremely stable, high-performance kernel that is capable of efficiently using all cpu, memory, and I/O resources thrown at it.
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MOGADISHU, Somalia -- The death toll from Saturday's truck bombing in Somalia's capital is now over 300, the director of an ambulance service said Monday, as this country reeled from the deadliest single attack it's ever experienced.

More people have died of their wounds in the past few hours, said Dr. Abdulkadir Adam of Aamin Ambulance. Funerals have continued and the death toll is expected to rise further.

Saturday's truck bombing targeted a crowded street in Mogadishu, and about 300 others were injured. Somalia's government is blaming the al Qaeda-linked al-Shabab extremist group, whi
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ch has not commented.
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GnuPG is a complete and free implementation of the OpenPGP standard as defined by RFC4880 (also known as PGP). GnuPG allows to encrypt and sign your data and communication, features a versatile key management system as well as access modules for all kinds of public key directories. GnuPG, also known as GPG, is a command line tool with features for easy integration with other applications. A wealth of frontend applications and libraries are available. GnuPG also provides support for S/MIME and Secure Shell (ssh).

GnuPG is Free Software (meaning that it respects your freedom). It can be free
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ly used, modified and distributed under the terms of the GNU General Public License .
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An 8.5-tonne Chinese space station has accelerated its out-of-control descent towards Earth and is expected to crash to the surface within a few months.

The Tiangong-1 or “Heavenly Palace” lab was launched in 2011 and described as a “potent political symbol” of China, part of an ambitious scientific push to turn China into a space superpower.

It was used for both manned and unmanned missions and visited by China’s first female astronaut, Liu Yang, in 2012.

But in 2016, after months of speculation, Chinese officials confirmed they had lost control of the space station and it would cras
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h to Earth in 2017 or 2018. China’s space agency has since notified the UN that it expects Tiangong-1 to come down between October 2017 and April 2018.
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I love the idea of USB-C: one port and one cable that can replace all other ports and cables. It sounds so simple, straightforward, and unified. In practice, it’s not even close.

USB-C normally transfers data by the USB protocol, but it also supports Thunderbolt… sometimes. The 12-inch MacBook has a USB-C port, but it doesn’t support Thunderbolt at all. All other modern MacBook models support Thunderbolt over their USB-C ports… but if you have a 13-inch model, and it has a Touch Bar, then the right-side ports don’t have full Thunderbolt bandwidth.
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FreeBSD is a free and open-source Unix-like operating system descended from Research Unix via the Berkeley Software Distribution (BSD). Although for legal reasons FreeBSD cannot use the Unix trademark, it is a direct descendant of BSD, which was historically also called "BSD Unix" or "Berkeley Unix". The first version of FreeBSD was released in 1993, and as of 2005 FreeBSD was the most widely used open-source BSD distribution, accounting for more than three-quarters of all installed systems running open-source BSD derivatives.

FreeBSD has similarities with Linux, with two major differences
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in scope and licensing: FreeBSD maintains a complete operating system, i.e. the project delivers kernel, device drivers, userland utilities and documentation, as opposed to Linux delivering a kernel and drivers only and relying on third-parties for system software; and FreeBSD source code is generally released under a permissive BSD license as opposed to the copyleft GPL used by Linux.

The FreeBSD project includes a security team overseeing all software shipped in the base distribution. A wide range of additional third-party applications may be installed using the pkgng package management system or the FreeBSD Ports, or by directly compiling source code. Due to its permissive licensing terms, much of FreeBSD's code base has become an integral part of other operating systems, such as Juniper JUNOS, Apple's macOS, the Nintendo Switch system software, and the operating systems running on Sony's PlayStation 3and PlayStation 4.
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CentOS (/sɛnt.ɑːs/, from Community Enterprise Operating System) is a Linux distribution that attempts to provide a free, enterprise-class, community-supported computing platform functionally compatible with its upstream source, Red Hat Enterprise Linux (RHEL).In January 2014, CentOS announced the official joining with Red Hat while staying independent from RHEL, under a new CentOS governing board.

The first CentOS release in May 2004, numbered as CentOS version 2, was forked from RHEL version 2.1AS. Since the release of version 7.0, CentOS officially supports only the x86-64 architecture, w
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hile versions older than 7.0-1406 also support IA-32 with Physical Address Extension (PAE). As of December 2015, AltArch releases of CentOS 7 are available for the IA-32 architecture, Power architecture, and for the ARMv7hl and AArch64 variants of the ARM architecture.

( Source: https://en.wikipedia.org/wiki/CentOS )

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