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berkeman's latest activity
berkeman
reacted to
davenn's post
in the thread
A very puzzling rock or a pallasite / mesmosiderite or a nothing burger
with
Like
.
ohhh totally agree, I deal with this daily on various facebook meteorite collector groups yup all meteorites are not magnetic ...
Yesterday, 9:33 PM
berkeman
reacted to
Alex A's post
in the thread
MCNPX Transformation
with
Informative
.
So the basic 2D rotation matrix is, cos sin -sin cos So the do nothing rotation by 0 degrees is 1 0 0 1 In 3D we have a 3x3...
Yesterday, 8:40 PM
berkeman
reacted to
davenn's post
in the thread
Even Engineers Doodle -- on the ICs they design
with
Like
.
for sure gosh, it's been years since i last did that i have been reinspired tp decap a few more chips :smile::smile:
Yesterday, 8:21 PM
berkeman
reacted to
Flyboy's post
in the thread
Random Photos
with
Like
.
Found a robin nest at Iowa State University. Mama Robin was not amused by my presence so I took my photo and left quickly.
Yesterday, 7:05 PM
berkeman
replied to the thread
Forum functionality for "New Topics" or "New Posts"
.
So I'm chopped liver is what you are saying... :oldeyes:
Yesterday, 6:47 PM
berkeman
reacted to
Renato Murback's post
in the thread
A
Relation between nuclear shape and it spin number
with
Like
.
I'll learn about that. Thank you
Yesterday, 6:38 PM
berkeman
reacted to
Vanadium 50's post
in the thread
Stargazing
Dark matter and its effect on the orbit of stars
with
Informative
.
Back to the post at hand. (1) The premise that scientists are a bunch of ignorant yahoos that need the OP to point the way...
Yesterday, 6:38 PM
berkeman
replied to the thread
Forum functionality for "New Topics" or "New Posts"
.
So one alternative to this is to "Watch" the forums you are interested in, and that way you will receive a notice whenever a new thread...
Yesterday, 6:07 PM
berkeman
reacted to
davenn's post
in the thread
Collection of Lame Jokes
with
Haha
.
Engineers joke!😄🛠️ A priest, a doctor, and an engineer were waiting one morning for a particularly slow group of golfers. The engineer...
Yesterday, 5:54 PM
berkeman
reacted to
Baluncore's post
in the thread
An interesting motorcycle travel blog
with
Informative
.
My guess would be that it is a Muslim minaret. The loudspeaker, visible on one wall, would be used for the call to prayer, reducing the...
Yesterday, 4:42 PM
berkeman
reacted to
docnet's post
in the thread
An interesting motorcycle travel blog
with
Informative
.
If I remember correctly (it's hard to find the original photo among the 165 pages ) Margus & Karina (the bloggers) didn't know either...
Yesterday, 4:22 PM
berkeman
reacted to
Gleb1964's post
in the thread
B
Questions about the Paraxial equation for a single spherical surface
with
Like
.
In your first message you was asked about paraxial equation, but your picture was about exact real ray tracing in meridional plane, not...
Yesterday, 1:22 PM
berkeman
reacted to
somegrue's post
in the thread
COVID
Is it usual for vaccine injection site to hurt again during infection?
with
Like
.
As I said, none of the risk factors they mention apply, so I can't imagine it having been that cut and dry in my case. What I can easily...
Yesterday, 12:06 PM
berkeman
reacted to
Ibix's post
in the thread
Stargazing
Dark matter and its effect on the orbit of stars
with
Informative
.
Black holes have been considered, yes. You need more than thousands of them - you need more mass in them than there is in the visible...
Yesterday, 12:01 PM
berkeman
reacted to
bhobba's post
in the thread
B
Excellent Free Course On Einsten, Relativity, His Views Etc from Harvard
with
Like
.
Hi All I just finished the following course on Einstein and Relativity...
Yesterday, 11:39 AM
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