How much money did I make from an app?

Undoubtedly some people are very successful in making money by developing a smartphone app. Back in 2012 I developed an app called “Handbook of...
Xu Cui
27 sec read

Excel tip: how to unhide the first column

When you hide column A, you may have assumed it’s very easy to unhide it later. It’s not true. Here is how you unhide...
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11 sec read

An interesting gamble

The other day I was walking on a street, along which there are a lot of booths where people play games to gamble. I...
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1 min read

How to download emails in Gmail?

Log in to your gmail On the top-right corner, you will find your own icon, click it. A pop up window will show Click...
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14 sec read

How to split a PDF file for free?

I have a PDF file which contains many pages. For some reason I need to send only page 3 and 5 to a friend....
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16 sec read

Driver Detective

I had been using a Lenovo Edge laptop, and one day it died. The operation system (windows 7) was corrupted. After installing a new...
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37 sec read

Apply a Formula to an Entire Column in Excel

Two Ways to Apply a Formula to an Entire Column in Excel This small trick can be handy if you have a lot of...
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9 sec read

Say No to SCA 5

Universities should not accept students based on race. Say No to SCA 5
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2 sec read

Find unique values in Excel

Assume you have two columns in an Excel sheet. Column A contains some names, Column B also contains some names, some of which are...
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22 sec read

How to retrieve text from a picture

Update: a free online tool where you can paste image directly: I get a picture and would like to copy the text in...
Xu Cui
19 sec read