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Today online applications bundle user interface, code and data. Facebook, for instance, is best known for its website and app, but both are just the tip of a virtual iceberg: most of the software and all the information that keep the social network going lives in the firm’s cloud. Controlling those data gives these companies power. Users are free to move to another service, but they would lose all that information, including the links to their friends. By contrast, in the new world of Web 3.0 (or Web 3, for the truly initiated), interface, code and data are meant to be kept separate. This would allow power to flow back to users, who could decide which application can access their information. If they were not happy with one social network, they could easily switch to another. With such decentralised applications, or “dapps”, users could also interact directly with other users without an information-hoarding intermediary in the middle.

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To be sure, similar ideas have been tried before—and failed. Decentralised services, then called “peer-to-peer”, briefly flourished in the late 1990s and early 2000s. They fizzled out mainly because no one knew how to build a robust decentralised database. That changed in 2009 with the invention of Bitcoin and the blockchain, the technology that underlies the crypto-currency. In essence, it is a ledger without a centralised administrator, maintained collectively by some of its users, called “miners”, who also protect the blockchain and keep each other in check.

Though these days Bitcoin is mostly used to speculate, the crypto-currency can be seen as a dapp. The blockchain is a specialised database in the form of an immutable record of the transaction history of every bitcoin in circulation, which makes it clear who owns what. Holders of the currency use a piece of software called a “wallet”, essentially a browser for the blockchain that carries the necessary cryptographic keys, to keep track of their assets and transfer money.

Almost all Web 3.0 projects borrow heavily from Bitcoin and Ethereum, another blockchain that comes with “smart contracts”, snippets of code that encapsulate business rules which are executed automatically if certain events occur. The most advanced projects focus on building the software infrastructure needed for dapps. Blockstack, arguably the most ambitious, is best seen as an operating system for such applications.

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SkyTrak Launch Monitor ist ein komplettes Trainings-, Spiel- und Unterhaltungssystem, konzipiert für Golfer zuhause oder auf der Range. SkyTrak liefert Höchstleistung durch einen revolutionären Durchbruch in der Technologie der Launch Monitore, die professionelle Genauigkeit und Zuverlässigkeit in der Erfassung von Ballflugdaten ermöglicht, aber zu einem von Privatpersonen leistbaren Preis.,Kostengünstig: Zuhause üben mit der Gewissheit, dass Sie die dieselbe Genauigkeit und Leistung wie von einem High-End Gerät bekommen, aber zu einem Bruchteil der Kosten,Unterhaltend und kurzweilig: Mit SkyTrak hat man Spaß am Training mit den Spielen und Wettbewerben, die spezielle Fähigkeiten aufbauen. Spielen Sie gegen Ihre Freunde, und werden Sie dabei besser,Transportabel: SkyTrak geht mit Ihnen! Ob zu Hause oder auf der Range, verbinden Sie einfach Ihr iPad mit SkyTraks eingebautem Wi-Fi.,Genauigkeit: SkyTrak benutzt Hochgeschwindigkeits-Fotographie um die Bewegung des Golfballes zu messen und liefert genaue Daten von Ballgeschwindigkeit, Steigungswinkel, Richtung und Spin. SkyTrak Photometrischer Launch Monitor Selbstnivellierend durch Accelerometer Keine Kalibrierung notwendig Abmessungen: 14,6 x 17,1 x 6,4 cm (LxHxB) Gewicht: 0,8 kg Genauigkeit der Meßdaten Ball Geschwindigkeit: 0-320 kmh +/- 1,6 kmh Steigungswinkel: 0-55° +/- 1° Back Spin: 0-12,000 U/min +/- 250 U/min Side Spin: 0-4,000 U/min +/- 250 U/min Azimuth: 0-20° +/- 2° Lieferumfang SkyTrak Einheit SkyTrak Basis App USB Ladekabel Strom/Batterie Eingebaute wiederaufladbare Lithium-Ionen Batterie Bis zu 5 Stunden ununterbrochene Nutzung Mikro USB Ladekabel inkludiert Wireless Verbindung Verbindet sich direkt mit iPad Wi-Fi (dabei kein Internet-Zugang) Verbindung mit Tablets/PCs mittels Router/Heimnetzwerk (Internet Zugang)

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Schutz,SkyTrak,Launchmonitor Der Schutzkäfig schützt den SykTrak bestmöglich gegen Beschädigungen. Das graue Vollmetall-Gehäuse ist äusserst stabil und durch die drei justierbaren Füsschen auch auf der Range einsetzbar. Das integrierte Wasserwagen Auge erleichert die korrekte Einstellung. Gewicht ohne SkyTrak 1700g

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Standalone device(no phone app needed),Instant feedback via LCD display,Measures: Carry Distance, Swing Speed, Ball Speed and Smash Factor,3 Modes: Practice, Target, Random,Available in Black or White The Swing Caddie SC100 Launch Monitor is a Standalone device(no phone app needed) that will offer Instant feedback via LCD display of your golf stroke. It will measures the Carry Distance, Swing Speed, Ball Speed and Smash Factor and return these results on the display. Has 3 Modes: Practice, Target, Random and statistics for each club used. Will display shot count and time display. Comes with remote control for ease of use and a pouch for safe storage of the unit.

Most people don’t need a webcam than can do 60 fps. Most webcams, including our top pick, record and stream video at 30 fps, and if you use your webcam only for chatting, meetings, or basic videos and streams, that’s more than enough. Chat services like Google Hangouts and Skype usually default to 30 fps video to save bandwidth (and most don’t support 60 fps video at all), and 60 fps files are twice as large as 30 fps videos because they’re capturing twice the number of frames.

A 60 fps webcam is primarily of interest to people who frequently stream using live video services like Twitch, which can stream 1080p videos at up to 60 fps . For streamers who overlay video of themselves atop 60 fps game footage, having a webcam that can also record at 60 fps makes for a smoother, nicer-looking stream. And the C922x comes with a tripod, which gives streamers more flexibility than the normal C920-style clip allows.

The C922x also includes software that tries to separate you from your background, creating a green screen-style, background-replacement effect without the added cost, equipment, and space you’d need for an actual green screen. Removing the room behind you means that your webcam overlay takes up less space—it’s just you, not you and everything behind you—and obscures less of whatever is streaming underneath.

The Windows-only ChromaCam software that the C922x uses for background replacement actually works with any webcam, including the C920. The version Logitech includes with the C922x offers the same features as the $30 Pro version—it removes the ChromaCam watermark and lets you insert your own, and it lets you load custom background images and PowerPoint presentations.

In our testing, the feature did an okay job distinguishing my torso, head, and hair from the rest of the room as long as the light was good, but it had trouble recognizing or separating my arms and hands from the background, and it sometimes included the back of my chair, too. When we used the ChromaCam software with our top pick, the C920, the background replacement effect seemed to work about as well as it did for the C922x, so you’d probably be better off paying for the Pro version of ChromaCam instead of upgrading to a C922x just to get this feature.

For everyday use, the C922x works just about as well as the C920; our testers slightly preferred the C920’s pictures and video in our tests, but the C922x was almost always a close second. The exposure, color, and level of detail captured by the two cameras are similar overall, and most testers still preferred the C922x to the more expensive Logitech Brio.

The C922x is also easy to set up, and, as with the C920, you’ll need to install extra software only if you want to control the exposure and white balance settings manually—or if you want to use the ChromaCam software for background replacement. Both the Windows and versions of the Logitech Camera Settings app for the C922x require you to open a separate app like the Windows Camera app or Photo Booth to preview your image as you adjust it.

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