life

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...
Xu Cui
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...
Xu Cui
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...
Xu Cui
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....
Xu Cui
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...
Xu Cui
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...
Xu Cui
9 sec read

Say No to SCA 5

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

How to retrieve text from a picture

Update: a free online tool where you can paste image directly: https://alivelearn.net/?p=2047 I get a picture and would like to copy the text in...
Xu Cui
19 sec read