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2. WhatsApp - Wikipedia

   en.wikipedia.org/wiki/WhatsApp

   WhatsApp Web's user interface is based on the default Android one and can be accessed through web.whatsapp.com. Access is granted after the users scan their personal QR code through their mobile WhatsApp application. There are similar solutions for macOS, such as the open-source ChitChat, previously known as WhatsMac. [193] [194] [195]

3. QR code - Wikipedia

   en.wikipedia.org/wiki/QR_Code

   The QR code system was invented in 1994, at the Denso Wave automotive products company, in Japan. [5] [6] [7] The initial alternating-square design presented by the team of researchers, headed by Masahiro Hara, was influenced by the black counters and the white counters played on a Go board; [8] the pattern of position detection was found and determined by applying the least-used ratio (1:1:3 ...

4. Signal Protocol - Wikipedia

   en.wikipedia.org/wiki/Signal_Protocol

   signal.org /docs. The Signal Protocol (formerly known as the TextSecure Protocol) is a non- federated cryptographic protocol that provides end-to-end encryption for voice and instant messaging conversations. [2] The protocol was developed by Open Whisper Systems in 2013 [2] and was introduced in the open-source TextSecure app, which later ...

5. Cancer Symptoms: Early Warning Signs You Shouldn't Ignore - WebMD

   www.webmd.com/cancer/understanding-cancer-symptoms

   Unusual bleeding. Cancer can make blood show up where it shouldn’t be. Blood in your poop can be a symptom of colon or rectal cancer. Also, tumors along your urinary tract can cause blood in ...

6. Text messaging - Wikipedia

   en.wikipedia.org/wiki/Text_messaging

   A text message conversation on an iPhone. Text messaging, or texting, is the act of composing and sending electronic messages, typically consisting of alphabetic and numeric characters, between two or more users of mobile phones, tablet computers, smartwatches, desktops / laptops, or another type of compatible computer.

7. Why Is My Poop Black? 7 Causes of Black or Tarry Stool - WebMD

   www.webmd.com/digestive-disorders/black-tarry...

   A bleeding ulcer is the most common concerning cause of dark stools. An ulcer is an open sore on the inside of your stomach or small intestine. Sometimes these sores bleed. This can make your poop ...

8. Katy Perry’s QR code tattoo at the VMAs explained - AOL

   www.aol.com/katy-perry-qr-code-tattoo-152257620.html

   Katy Perry donned some fresh ink on the MTV Video Music Awards (VMAs) red carpet on Wednesday (September 11). Ahead of the ceremony at New York’s UBS Arena, the 39-year-old pop star posed for ...

9. Timeline of WhatsApp - Wikipedia

   en.wikipedia.org/wiki/Timeline_of_WhatsApp

   The WhatsApp support staff announce that messages were encrypted in the "latest version" of the WhatsApp software for iOS and Android (but not BlackBerry, Windows Phone, and Symbian), without specifying the cryptographic method. [8] 2013: February: Userbase: WhatsApp's user base swells to about 200 million active users and its staff to 50. [2 ...