# Richard Feynman

If you are a student, please watch this and contemplate on the way he explains and answers.

# I = – log(p(x))

I : the amount of Information,
p(x) : the probability to observe an event x

I watched a lecture video by Ali Ghodsi, a professor in the computer science department at the University of Waterloo, explaining “Variational Autoencoder.”

If an event x happens with high probability, it contains little information. Whereas, if x happens with low probability, then it contains much information.

He asked the class, “Is this intuitive?”

Then, he goes, “if something predictable happens, we do not have much interest in it. However, we will be very much interested in something unpredictable. For example, D. Trump is unpredictable, which makes him always on the news. While, J. Trudeau (the prime minister, Canada) is predictable and is not on the news.”

What an easy explanation for students to grasp $I=-log(p(x))$.

# Back to UNIST

It took almost 24 hours to come back from door to door:

40 minutes to get to LAX,
2.5 hours of waiting for boarding,
11 hours of air time,
1.5 hours of reporting and confirming the COVID-19 negative result with the self-quarantine notification and of retrieving my luggage,
2 hours of waiting for a shuttle to a KTX station,
4 hours of transit time to Ulsan KTX,
50 minutes to get home including additional COVID-19 test at the station.

# Terrible history…

A researcher affiliated with Northeast Asian History Foundation found a classified document in Japan reported in March 1945, just before the end of the World War II, showing how and where Japan had tried to set up an underground arsenal in Incheon, South Korea, to continue their fight against the U.S. This article is written in Korean: https://news.v.daum.net/v/k9j70kO5Dv.

# Rubik’s Cube

I recently started learning how to solve a 3×3 Rubik’s Cube that I have been longing to possess. Actually, I have got one for my kids. But my wife and I are having fun with it. (I bought another one for myself after playing with it for a few hours.)

Here is a basic solution to solve it: