Find an example of the need for or use of transactions / concurrency control or recovery in the real world. This example might be taken from an online article - magazine, newspaper, blog post:

• A link to any relevant material (a link to an article not Newyork Times link since I have to paid to see that link)
• A description of the situation where transactions / concurrency control or recovery were needed or used (description not needed if you posted a link)
• Required by all: Why were transactions / concurrency needed or used in this particular situation?