Do Aliens Exist? Technosignatures, Part 2

Have we found any alien civilizations? What have our scientific searches found so far? What searches have been conducted and what have they been looking for? In this final video in our series on the search for alien life and intelligence we discuss these searches for technological traces and evidences, so called technosignatures.
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******CONTENTS*******
0:00 Introduction
0:38 Infrared: Dyson Spheres and Swarms
3:00 Optical SETI
4:33 KIC 8462852 ("Tabby's Star")
6:22 Vanishing Stars (VASCO Project)
8:18 Przybylski's Star
10:06 Oumuamua
13:32 The Fermi Paradox: Possible Explanations
16:09 Why search for Extraterrestrial Intelligence?
16:28 Conclusion
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Links to my 3 books on physics:
Volume 1:
"Everyone's Field Guide to Physics: Volume I: The Familiar World": www.amazon.com/Everyones-Fiel...
Volume 2:
"Everyone's Field Guide to Physics: Volume II: The Ethereal Trinity": www.amazon.com/Everyones-Fiel...
Volume 3:
"Everyone's Field Guide to Physics: Volume III: The Unfamiliar World": www.amazon.com/Everyones-Fiel...
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CREDITS:
vecteezy.com
Dyson Spheres:
fermatslibrary.com/s/search-f...,
arxiv.org/abs/1804.08351,
arxiv.org/abs/2201.11123,
iopscience.iop.org/article/10...
Optical SETI: technosearch.seti.org/optical...,
technosearch.seti.org/sites/d...
Oumuamua: iopscience.iop.org/article/10...
Technosearch list:
technosearch.seti.org/