Update leeches.md (#194)

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* Update leeches.md

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-Leeches are cards that you keep on forgetting. Because they require so
-many reviews, they take up a lot more of your time than other cards.
+Leeches are cards that you keep forgetting. Because they require so
+many reviews, they take up a lot more of your time, compared to other cards.
 
-Anki can help you identify leeches. Each time a review card 'lapses' (is
-failed while it is review mode), a counter is increased. When that
-counter reaches 8, the note is tagged as a leech, and the card is
-suspended. The threshold, and whether to suspend or not, can be adjusted
-in the [deck options](deck-options.md).
+Anki can help you identify leeches. Each time a review card 'lapses' (is 
+failed while it is in review mode), a counter increases. When this counter
+reaches 8, Anki tags the note as a leech and suspends the card. The 
+threshold, and whether to suspend or not, can be adjusted in the
+[deck options](deck-options.md).
 
-Anki will continue to issue leech warnings periodically for a difficult
-card. The warning interval is half the initial leech threshold. That is,
-if you have Anki configured to warn at 8 lapses, future warnings will
-happen every 4 lapses. (12, 16, etc)
+If you keep failing that card, Anki will continue to alert you about the 
+leech periodically. These warnings occur at half the initial leech 
+threshold. For example, if you set the warning at 8 lapses, future 
+warnings will happen every 4 lapses (at 12, 16, and so on).
 
-Once a leech is found, there are a number of ways you can handle it.
+Once a leech is found, there are several ways to handle it.
 
-## Waiting
+## Editing
 
-Some leeches are caused by 'interference'. For example, an English
-learner may have recently learnt the words "disappoint" and "disappear".
-As they look similar, the learner may find themselves confusing the two
-when trying to answer. In these situations, it’s often productive to
-concentrate on just one idea. When that idea is firmly ingrained in your
-mind, you can then return to learning the other idea. So in these
-situations, you may want to leave one of the words suspended until you
-have learnt the other one well, and then unsuspend it in the browser.
+The most efficient method to deal with leeches is to change how the
+information is presented. Maybe your cards have too much information, or 
+you’re trying to memorize something without fully understanding it. Often, 
+it helps to follow the [20 rules of formulating 
+knowledge](https://supermemo.guru/wiki/20_rules_of_knowledge_formulation),
+proposed by Dr Piotr Wozniak, the creator of SuperMemo. Some cards can 
+benefit from a mnemonic. Even some well-written cards may need a boost in 
+coherence, e.g. by adding cards for related concepts. However, it takes a 
+lot of experience to know how to formulate the material properly, break it 
+down into smallest possible components, and use mnemonic techniques.
 
 ## Deleting
 
-Another way to manage leeches is to delete them. Consider if the
-material you’re struggling with is important enough to make it worth
-your while. By selectively deleting difficult and obscure items, you can
-dedicate more time to learning other material, and studying becomes a
-lot more fun.
+If the material you’re struggling with isn't important enough to justify 
+the time spent, you can simply delete the card. By selectively deleting
+difficult and obscure items, you can spend more time learning other 
+material, making studying more enjoyable. If you think the card might be 
+useful for future reference, you can leave it suspended.
 
-## Editing
+## Waiting
 
-Another approach is to change the way the information is presented.
-Perhaps the cards you have created have too much information on them, or
-perhaps you’re trying to memorize something without fully understanding
-it. Sometimes spending some time changing the way the card is phrased
-can help. It’s also a good time to think about making a mnemonic to help
-you remember.
+Some leeches are caused by 'interference'. For example, an English
+learner may have recently learnt the words "disappoint" and "disappear".
+As they look similar, the learner may find themselves confusing the two
+when trying to answer. In such situations, it’s often helpful to
+concentrate on one idea at a time. Once that idea is firmly ingrained in 
+your mind, you can then start learning the other idea. So, in these
+situations, you might want to leave one of the words suspended until you
+have learnt the other one well, and then unsuspend it.
+
+For a more detailed discussion, you can refer to the article "[Dealing 
+with Leeches](https://controlaltbackspace.org/leech/)", written by Soren 
+Bjornstad.