Paul Halpern
@phalpern.bsky.social
Physicist and Science Writer. Author of eighteen books, most recently The Allure of the Multiverse: Extra Dimensions, Other Worlds, and Parallel Universes
Richard Feynman on String Theory:
'I have noticed when I was younger that a lot of old men in the field couldn’t understand new ideas very well...
I’m an old man now, and these are new ideas, and they look crazy to me, and they look like they’re on the wrong track.'
#Physics #Feynman #Science
'I have noticed when I was younger that a lot of old men in the field couldn’t understand new ideas very well...
I’m an old man now, and these are new ideas, and they look crazy to me, and they look like they’re on the wrong track.'
#Physics #Feynman #Science
November 25, 2025 at 12:38 PM
A holiday gift for those who have it all
The Allure of the Multiverse
An extraordinary voyage into the history of parallel universes, higher dimensions, and time travel in speculative science and imaginative fiction.
Available at:
amazon.com/Allure-Multi...
hachettebookgroup.com/titles/paul-...
The Allure of the Multiverse
An extraordinary voyage into the history of parallel universes, higher dimensions, and time travel in speculative science and imaginative fiction.
Available at:
amazon.com/Allure-Multi...
hachettebookgroup.com/titles/paul-...
November 25, 2025 at 12:36 PM
A holiday gift for those who have it all
The Allure of the Multiverse
An extraordinary voyage into the history of parallel universes, higher dimensions, and time travel in speculative science and imaginative fiction.
Available at:
amazon.com/Allure-Multi...
hachettebookgroup.com/titles/paul-...
The Allure of the Multiverse
An extraordinary voyage into the history of parallel universes, higher dimensions, and time travel in speculative science and imaginative fiction.
Available at:
amazon.com/Allure-Multi...
hachettebookgroup.com/titles/paul-...
'Strange is our situation here upon earth.
Each of us comes for a short visit, not knowing why, yet sometimes seeming to divine a purpose..
There is one thing we do know: that man is here for the sake of other men.. upon whose well-being our own happiness depends.'
-Albert Einstein
#ScienceSky
Each of us comes for a short visit, not knowing why, yet sometimes seeming to divine a purpose..
There is one thing we do know: that man is here for the sake of other men.. upon whose well-being our own happiness depends.'
-Albert Einstein
#ScienceSky
November 20, 2025 at 8:51 PM
'Strange is our situation here upon earth.
Each of us comes for a short visit, not knowing why, yet sometimes seeming to divine a purpose..
There is one thing we do know: that man is here for the sake of other men.. upon whose well-being our own happiness depends.'
-Albert Einstein
#ScienceSky
Each of us comes for a short visit, not knowing why, yet sometimes seeming to divine a purpose..
There is one thing we do know: that man is here for the sake of other men.. upon whose well-being our own happiness depends.'
-Albert Einstein
#ScienceSky
Richard Feynman and Julian Schwinger, two of the recipients of the 1965 Nobel Prize in Physics and both New Yorkers, were intellectual rivals
Schwinger would assert that he never used Feynman diagrams
Feynman would pretend to students that he couldn't pronounce Schwinger's name
#ScienceSky
Schwinger would assert that he never used Feynman diagrams
Feynman would pretend to students that he couldn't pronounce Schwinger's name
#ScienceSky
November 20, 2025 at 8:47 PM
Richard Feynman and Julian Schwinger, two of the recipients of the 1965 Nobel Prize in Physics and both New Yorkers, were intellectual rivals
Schwinger would assert that he never used Feynman diagrams
Feynman would pretend to students that he couldn't pronounce Schwinger's name
#ScienceSky
Schwinger would assert that he never used Feynman diagrams
Feynman would pretend to students that he couldn't pronounce Schwinger's name
#ScienceSky
Annual holiday tradition:
Thanksgiving Turkey Feynman Diagram, drawn by particle physicist Yuhsin Tsai:
quantumdiaries.org/2009/11/26/t...
#HappyThanksgiving #LHC #physics
Thanksgiving Turkey Feynman Diagram, drawn by particle physicist Yuhsin Tsai:
quantumdiaries.org/2009/11/26/t...
#HappyThanksgiving #LHC #physics
November 20, 2025 at 8:45 PM
Annual holiday tradition:
Thanksgiving Turkey Feynman Diagram, drawn by particle physicist Yuhsin Tsai:
quantumdiaries.org/2009/11/26/t...
#HappyThanksgiving #LHC #physics
Thanksgiving Turkey Feynman Diagram, drawn by particle physicist Yuhsin Tsai:
quantumdiaries.org/2009/11/26/t...
#HappyThanksgiving #LHC #physics
Tributes at Bryn Mawr College to the brilliant mathematician Emmy Noether, who spent her final years there. Noether revolutionized the methods of modern physics by identifying continuous symmetry groups with conservation laws. The third image is her grave marker.
#Science #Mathematics #Physics
#Science #Mathematics #Physics
November 12, 2025 at 11:57 AM
Tributes at Bryn Mawr College to the brilliant mathematician Emmy Noether, who spent her final years there. Noether revolutionized the methods of modern physics by identifying continuous symmetry groups with conservation laws. The third image is her grave marker.
#Science #Mathematics #Physics
#Science #Mathematics #Physics
'A wonder of this kind I experienced as a child of four or five years when my father showed me a compass. That this needle behaved in such a determined way did not at all fit [my preconceptions] ... This experience made a deep and lasting impression upon me.'
-Albert Einstein
#Einstein #Science
-Albert Einstein
#Einstein #Science
November 3, 2025 at 12:06 PM
Albert Einstein never worked in the Manhattan Project to create a nuclear weapon.
However, he did offer scientific advice to the U.S. Navy during World War II.
Here's an image of Einstein discussing his defense research with naval officers in 1943.
#Einstein #science #ScienceSky
However, he did offer scientific advice to the U.S. Navy during World War II.
Here's an image of Einstein discussing his defense research with naval officers in 1943.
#Einstein #science #ScienceSky
November 3, 2025 at 12:01 PM
Albert Einstein never worked in the Manhattan Project to create a nuclear weapon.
However, he did offer scientific advice to the U.S. Navy during World War II.
Here's an image of Einstein discussing his defense research with naval officers in 1943.
#Einstein #science #ScienceSky
However, he did offer scientific advice to the U.S. Navy during World War II.
Here's an image of Einstein discussing his defense research with naval officers in 1943.
#Einstein #science #ScienceSky
Richard Feynman dressed as a Ladakhi monk, painted by Pasadena artist Sylvia Posner. The 'lightning bolt' he is clutching in his right hand resembles one of his scientific diagrams.
More about the costume parties Feynman attended: medium.com/starts-with-... #Feynman #Halloween #science #physics
More about the costume parties Feynman attended: medium.com/starts-with-... #Feynman #Halloween #science #physics
October 25, 2025 at 4:05 PM
Richard Feynman dressed as a Ladakhi monk, painted by Pasadena artist Sylvia Posner. The 'lightning bolt' he is clutching in his right hand resembles one of his scientific diagrams.
More about the costume parties Feynman attended: medium.com/starts-with-... #Feynman #Halloween #science #physics
More about the costume parties Feynman attended: medium.com/starts-with-... #Feynman #Halloween #science #physics
'The existence and validity of human rights are not written in the stars..
A large part of history is therefore replete with the struggle for those rights.. in which a final victory can never be won.
But to tire in that struggle would mean the ruin of society'
-Albert Einstein
#Einstein #Science
A large part of history is therefore replete with the struggle for those rights.. in which a final victory can never be won.
But to tire in that struggle would mean the ruin of society'
-Albert Einstein
#Einstein #Science
October 13, 2025 at 2:14 PM
Need a great costume idea this Halloween? Dress up as your favorite Feynman diagram!
symmetrymagazine.org/article/octo...
#HalloweenScience #happyhalloween2025 #Science #ScienceSky #Physics
symmetrymagazine.org/article/octo...
#HalloweenScience #happyhalloween2025 #Science #ScienceSky #Physics
October 13, 2025 at 2:11 PM
Need a great costume idea this Halloween? Dress up as your favorite Feynman diagram!
symmetrymagazine.org/article/octo...
#HalloweenScience #happyhalloween2025 #Science #ScienceSky #Physics
symmetrymagazine.org/article/octo...
#HalloweenScience #happyhalloween2025 #Science #ScienceSky #Physics
Thinking about what to wear for Halloween?
Nuclear shell model pioneer Maria Goeppert Mayer, the second woman to receive a Nobel Prize in Physics, shows off her wonderful bat costume
(AIP ESVA)
#Science #ScienceSky #Physics #Halloween #HappyHalloween
Nuclear shell model pioneer Maria Goeppert Mayer, the second woman to receive a Nobel Prize in Physics, shows off her wonderful bat costume
(AIP ESVA)
#Science #ScienceSky #Physics #Halloween #HappyHalloween
October 13, 2025 at 2:08 PM
Thinking about what to wear for Halloween?
Nuclear shell model pioneer Maria Goeppert Mayer, the second woman to receive a Nobel Prize in Physics, shows off her wonderful bat costume
(AIP ESVA)
#Science #ScienceSky #Physics #Halloween #HappyHalloween
Nuclear shell model pioneer Maria Goeppert Mayer, the second woman to receive a Nobel Prize in Physics, shows off her wonderful bat costume
(AIP ESVA)
#Science #ScienceSky #Physics #Halloween #HappyHalloween
Albert Einstein moved to the United States on October 17, 1933.
Two weeks later was Halloween.
When a group of girl trick-or-treaters knocked on his door that evening, Einstein came to the front porch and played the violin for them:
capitalcentury.com/1933.html
#HappyHalloween2025 #ScienceSky
Two weeks later was Halloween.
When a group of girl trick-or-treaters knocked on his door that evening, Einstein came to the front porch and played the violin for them:
capitalcentury.com/1933.html
#HappyHalloween2025 #ScienceSky
October 7, 2025 at 12:10 AM
Albert Einstein moved to the United States on October 17, 1933.
Two weeks later was Halloween.
When a group of girl trick-or-treaters knocked on his door that evening, Einstein came to the front porch and played the violin for them:
capitalcentury.com/1933.html
#HappyHalloween2025 #ScienceSky
Two weeks later was Halloween.
When a group of girl trick-or-treaters knocked on his door that evening, Einstein came to the front porch and played the violin for them:
capitalcentury.com/1933.html
#HappyHalloween2025 #ScienceSky
SPOOKY QUANTUM PHYSICS! 🎃👻
'I cannot seriously believe in [quantum mechanics] because the theory cannot be reconciled with the idea that physics should represent a reality in space and time, free from spooky actions at a distance.'
-Albert Einstein to Max Born
March 3, 1947
#Halloween2025
'I cannot seriously believe in [quantum mechanics] because the theory cannot be reconciled with the idea that physics should represent a reality in space and time, free from spooky actions at a distance.'
-Albert Einstein to Max Born
March 3, 1947
#Halloween2025
October 7, 2025 at 12:09 AM
SPOOKY QUANTUM PHYSICS! 🎃👻
'I cannot seriously believe in [quantum mechanics] because the theory cannot be reconciled with the idea that physics should represent a reality in space and time, free from spooky actions at a distance.'
-Albert Einstein to Max Born
March 3, 1947
#Halloween2025
'I cannot seriously believe in [quantum mechanics] because the theory cannot be reconciled with the idea that physics should represent a reality in space and time, free from spooky actions at a distance.'
-Albert Einstein to Max Born
March 3, 1947
#Halloween2025
'Einstein's life was rich in genius and irony, passion for the issues of his time, insights into education, the connection between science and politics, and a demonstration that individuals can after all change the world.'
-Carl Sagan
newrepublic.com/article/1170...
#Einstein #Science #physics
-Carl Sagan
newrepublic.com/article/1170...
#Einstein #Science #physics
September 29, 2025 at 12:26 AM
'Einstein's life was rich in genius and irony, passion for the issues of his time, insights into education, the connection between science and politics, and a demonstration that individuals can after all change the world.'
-Carl Sagan
newrepublic.com/article/1170...
#Einstein #Science #physics
-Carl Sagan
newrepublic.com/article/1170...
#Einstein #Science #physics
'No one can work hard on a serious intellectual problem for more than four hours a day.'
-Nobel Laureate physicist Paul Dirac
Dirac had many hobbies including gardening, hiking, and reading.
(Quote and photo, courtesy of Monica Dirac)
#Science #quantum #ScienceSky
-Nobel Laureate physicist Paul Dirac
Dirac had many hobbies including gardening, hiking, and reading.
(Quote and photo, courtesy of Monica Dirac)
#Science #quantum #ScienceSky
September 27, 2025 at 11:58 PM
'No one can work hard on a serious intellectual problem for more than four hours a day.'
-Nobel Laureate physicist Paul Dirac
Dirac had many hobbies including gardening, hiking, and reading.
(Quote and photo, courtesy of Monica Dirac)
#Science #quantum #ScienceSky
-Nobel Laureate physicist Paul Dirac
Dirac had many hobbies including gardening, hiking, and reading.
(Quote and photo, courtesy of Monica Dirac)
#Science #quantum #ScienceSky
RELATIVITY
There was a young lady named Bright
Whose speed was far faster than light;
She set out one day
In a relative way
And returned on the previous night.
-A. H. Reginald Buller (1923)
#ScienceSky #Science #Physics #Einstein
There was a young lady named Bright
Whose speed was far faster than light;
She set out one day
In a relative way
And returned on the previous night.
-A. H. Reginald Buller (1923)
#ScienceSky #Science #Physics #Einstein
September 26, 2025 at 12:39 AM
RELATIVITY
There was a young lady named Bright
Whose speed was far faster than light;
She set out one day
In a relative way
And returned on the previous night.
-A. H. Reginald Buller (1923)
#ScienceSky #Science #Physics #Einstein
There was a young lady named Bright
Whose speed was far faster than light;
She set out one day
In a relative way
And returned on the previous night.
-A. H. Reginald Buller (1923)
#ScienceSky #Science #Physics #Einstein
International Einstein:
Four places where the brilliant physicist lived throughout his life:
Zürich (as a student attending the ETH)
Bern (as a patent officer)
Berlin (as a professor; original building was destroyed)
Princeton (in his later years)
All photos by Paul Halpern
#Einstein
Four places where the brilliant physicist lived throughout his life:
Zürich (as a student attending the ETH)
Bern (as a patent officer)
Berlin (as a professor; original building was destroyed)
Princeton (in his later years)
All photos by Paul Halpern
#Einstein
September 11, 2025 at 12:38 AM
International Einstein:
Four places where the brilliant physicist lived throughout his life:
Zürich (as a student attending the ETH)
Bern (as a patent officer)
Berlin (as a professor; original building was destroyed)
Princeton (in his later years)
All photos by Paul Halpern
#Einstein
Four places where the brilliant physicist lived throughout his life:
Zürich (as a student attending the ETH)
Bern (as a patent officer)
Berlin (as a professor; original building was destroyed)
Princeton (in his later years)
All photos by Paul Halpern
#Einstein
'I am happy because I want nothing from anyone. I do not care for money. Titles or distinctions mean nothing. I do not crave praise. The only thing that gives me pleasure, apart from my work, my violin and my sailboat, is the appreciation of my fellow worker'
-Albert Einstein
#Science #Einstein
-Albert Einstein
#Science #Einstein
September 1, 2025 at 1:46 PM
Particles in the universe are grouped into two categories, based on their statistical properties.
Force carriers are named after the scientist on the left.
The building blocks of matter are named after the one on the right.
Pictured: Satyendra Nath Bose and Enrico Fermi
#science #physics
Force carriers are named after the scientist on the left.
The building blocks of matter are named after the one on the right.
Pictured: Satyendra Nath Bose and Enrico Fermi
#science #physics
August 3, 2025 at 1:26 AM
Great scientists meeting with the Dalai Lama, who celebrates his 90th birthday today.
Carl Sagan
Werner Heisenberg
David Bohm
#histSTM #DalaiLama #FreeTibet
Carl Sagan
Werner Heisenberg
David Bohm
#histSTM #DalaiLama #FreeTibet
July 6, 2025 at 4:26 PM
Great scientists meeting with the Dalai Lama, who celebrates his 90th birthday today.
Carl Sagan
Werner Heisenberg
David Bohm
#histSTM #DalaiLama #FreeTibet
Carl Sagan
Werner Heisenberg
David Bohm
#histSTM #DalaiLama #FreeTibet
Groovy genius:
Albert Einstein the performer:
vocals, piano, and violin.
#Einstein #science #physics #ScienceSky
Albert Einstein the performer:
vocals, piano, and violin.
#Einstein #science #physics #ScienceSky
June 28, 2025 at 3:26 PM
Groovy genius:
Albert Einstein the performer:
vocals, piano, and violin.
#Einstein #science #physics #ScienceSky
Albert Einstein the performer:
vocals, piano, and violin.
#Einstein #science #physics #ScienceSky
'There exists a passion for comprehension, just as there is a passion for music. That passion is rather common in children, but gets lost in most people later on.'
-Albert Einstein
(On the Generalized Theory of Gravitation, Scientific American, 1950)
tinyurl.com/47r8yz23
#science #Einstein
-Albert Einstein
(On the Generalized Theory of Gravitation, Scientific American, 1950)
tinyurl.com/47r8yz23
#science #Einstein
June 28, 2025 at 3:23 PM
'There exists a passion for comprehension, just as there is a passion for music. That passion is rather common in children, but gets lost in most people later on.'
-Albert Einstein
(On the Generalized Theory of Gravitation, Scientific American, 1950)
tinyurl.com/47r8yz23
#science #Einstein
-Albert Einstein
(On the Generalized Theory of Gravitation, Scientific American, 1950)
tinyurl.com/47r8yz23
#science #Einstein