How to undo "Update Date" in dreamwidth post?

I accidentally clicked on "Update Date" on one of my older posting.
How do I revert that posting date to the original "Posted Date"?

Extracting a black hole image from "sparse telescope matrix"

Katie Bouman is a human face of the team that produced a black hole image that hit the news today:


2 years ago Katie delivered a TED talk about that image extraction efforts:
https://www.youtube.com/watch?v=BIvezCVcsYs

It is an interesting presentation, but I do NOT understand Katie's explanation about how they were going to minimize the bias [to "see" already predicted black hole visualization] while creatively interpreting inputs from sparsely placed telescopes around the earth.

Do you understand Katie's explanation?



Katie Bouman resume

How to Understand the Image of a Black Hole

Update:
Calibration Free Imaging

Update:
This posting is from ~2019-04-13
But I do not know how to set it back to that older date...

WHO spreads Coronavirus to journalists

Seattle official spreads coronavirus to journalists by licking fingers and passing out papers:
https://youtu.be/itR6v4o0L2k?t=126

World Health Organization promotes these healthy practices on YouTube.