Problem: Article: You can turn off notifications on a conversation-by-conversation basis, which can be useful if you don't want to be bothered by a busy conversation. The process is the same for both iOS and Android. This will open the conversation details. You'll see several different intervals you can mute notifications for. You will no longer be notified when you receive new messages in that conversation until you turn the mute off. You can select a shorter interval to have notifications turn back on automatically after a time.
Summary: Open the conversation you want to disable notifications for. Tap the recipient name at the top of the screen (iOS), or (Android). Tap the "Notifications" option. Select "Until I turn it back on" to completely disable notifications for that conversation.

Problem: Article: The staff is the set of 5 parallel lines on the page where notes are marked. The clef is the very first marking on the staff, at the left-hand side of the first staff line. This signifies the musical register in which you play. Violins only play in treble clef. This is the marking that resembles an &. Each note is a round circle on a line or in a space on the staff. The notes in the spaces, from bottom to top, are F, A, C and E. The notes on the lines, from bottom to top, are E, G, B, D, and F. Notes below or above the staff are marked with a round circle and a horizontal line going through the middle of the note. If there are flats (b) or sharps (#), these may be marked next to a note. They may also be marked next to the treble clef. For example, if a sharp is placed on the F line, this means that every F played in a given musical piece will be played as an F#. An open string means that it is not pressed with a finger when it's played. There are four open string notes on a violin: G, D, A and E. These strings are in order from thickest to thinnest string, or left to right when holding the violin in playing position. On sheet music, these notes are often marked with a 0. In order to play more notes than just G, D, A and E, you will need to press strings with your fingers. The fingers on your left hand are numbered 1 to 4. Your index finger is 1, your middle finger is 2, your ring finger is 3 and your pinky finger is 4. When a note is displayed on beginning violin sheet music, it will be accompanied by a number, 0 to 4. The 0 is an open note, while the other numbers correspond to a particular finger that will press a string. The notes on each string will ascend in tone as you place another finger down on the string. Start by drawing your bow across the D string without pressing it down. This will play a D note. Place your index finger on the D string and play. You are now playing the next note up on the D scale, or C#. Play the next three notes on the D scale by placing your middle, then ring, then pinky fingers on the string. After you have placed your pinky finger on the D string and you have played that note, move to the next string (the A string) to play the next note in this scale. Start by playing the A string open (no finger pressing the string). Subsequent notes will be played by pressing first your index finger, then your middle finger, and so on. While you practice pressing your fingers on the string in order, memorize the fingers that match the notes in the music. So, for example, when you see a D, you know that will be the open D string. When you see an F#, you'll know to press your middle finger on the D string. When playing the violin, one of your hands will wrap around the neck in order to press the strings with your fingers. The strings can be played closer to the pegbox, usually called 1st position, or closer to the bridge (3rd, 4th or even 5th position). These positions are noted on violin music with Roman numerals underneath a note. Move your hand down the fingerboard of the violin to correspond with the numbered position. 1st position, or I, means that your hand will play closer to the pegbox of the violin neck. These positions may also be marked as "1st position" or "3rd position," instead of using Roman numerals. Most beginner violin music is written for 1st position. Double stops are when you play two notes together. On the violin, you'll play two strings at the same time. Double stops are represented on the musical staff with two notes stacked on top of each other at the note position to which they correspond. The notes may not be stacked directly on top of each other. Rather, there is likely a space between each, but one is above the other note. Advanced violin music might have triple or even quadruple stops, meaning you play three or four notes together at the same time.
Summary: Identify the staff and clef. Learn the notes. Learn which notes correspond with open strings. Match numbers to each of your fingers. Learn the fingerings for the strings. Move your hand up or down the violin's neck when Roman numerals are noted on the music. Play two stacked notes as double stops.

Problem: Article: During the mating season, male ducks will have very bright coloration in their plumage to attract mates. After mating season, the male duck will molt and lose his bright coloration and resemble a female. Mallard ducks are sexually dimorphic, which means the males and females look different to each other. The females are brown and relatively dowdy, whereas the males have a vivid purple sash on the wings and are iridescent colors. The male Canvasback has solid white to light gray plumage. His female counterpart has plumage that is grayish-brown. The male Wood Duck has gray feathers with blue markings on the wings during mating season. The female's plumage is usually grayish-brown. Male and female Mottled Ducks have similarly colored feathers, making it difficult to tell them apart by plumage alone. Bill color is another way to tell the difference between a male and female duck. In many duck species, the bill color does not change during mating season, so this physical characteristic will stay the same throughout the year. In Mallards, the male duck has a bright yellow bill and the female has a brown and orange bill. In Mottled Ducks, the male duck has a bill that is a solid olive green to yellow color. The female's bill is brown to orange with dark splotches. Male Wood Ducks have a red bill that has a patch of yellow at the bottom. During mating season, the bill of the Ruddy Duck changes to a bright baby blue. Across species, male ducks tend to be larger than female ducks. In addition to have a larger body size in general, male Mallards, Rouens, and Welsh Harlequins, have larger heads and thicker necks than the females. Male ducks will have an upwardly curled feather near the tail; this is known as the 'sex feather.' This feather, which will become noticeable in male ducks when they are between two and four months old, remains after molting. Females do not have a sex feather. Female ducks tend to have a loud and hard quack. The quack of male ducks is usually soft and rough. If you have ducks as pets and you are comfortable handling them, you can gently hold the duck by its tail until it quacks. The sound of a quack can be used to differentiate between male and female ducks from the time that ducks are about one month old. In Muscovy ducks, the female's quack sounds like a trill or a coo. A male Muscovy will make a quack that's very deep and breathy (sounds like 'huch-uch-uch'). The female Grey Teal makes a quack that sounds like a cackling noise, which differentiates it from the male Grey Teal.
Summary:
Observe the duck's plumage (feathers). Observe the bill color. Look at the duck's size. Look for a curled feather near the tail. Listen to a duck's quack.