Curated Video
Dark Energy
Cosmologist Rocky Kolb (Chicago) provides a brief background on the mystery of dark energy while explaining why the phenomenon is personally bothering him.
Curated Video
Asking The Right Questions
Nobel Laureate Antony Leggett describes his gut feeling that cosmology is ripe for a major revolution, and describes why he is not particularly sympathetic to the field of "quantum cosmology".
Curated Video
Dark Matter
Astrophysicist Scott Tremaine (Institute for Advanced Study) describes why we believe that dark matter exists.
Curated Video
Turning the Universe Upside Down
Nobel Laureate Roger Penrose (Oxford) tells us why he is sceptical of the inflationary theory of cosmology.
Curated Video
Octaves and Harmonics
Nobel laureate in Physics David Politzer (Caltech) uses a banjo to demonstrate how octaves and harmonics arise from vibrating strings.
Curated Video
No Explanation
Nobel Laureate Roger Penrose, University of Oxford, describes why he believes that inflationary cosmology doesn't explain the mystery of why the universe began in such an unlikely, very smooth state, arguing that had it started out...
Curated Video
Inflationary Concerns #3 - Eternal Inflation
Cosmologist Paul Steinhardt (Princeton) highlights a major issue with the theory of cosmic inflation - so-called "eternal inflation" that results in what theorists call a "multiverse".
Curated Video
In Search of an Explanation
Cosmologist Justin Khoury, University of Pennsylvania, describes the enormous disparity between the observation and theoretical prediction of the vaccuum energy, commonly regarded as the worst failure of theoretical physics, and...
Curated Video
Too Smooth
Physicist Paul Steinhardt, one of the original developers of the theory of cosmic inflation, describes a key problem he faced at the beginning and what his thinking was to get around some of those early hurdles.
Curated Video
The Big Bounce?
Princeton University physicist Paul Steinhardt describes how we might get beyond the intellectual dead-end that the theory of cosmic inflation seems to have led us to.
Curated Video
The Big Bang Entropy Puzzle
Nobel Laureate in Physics Roger Penrose (Oxford) relates his longstanding bemusement at why the early universe was in such a peculiar low state of entropy.
Curated Video
The Anthropic Principle
Nobel Laureate in Physics Anthony Leggett (Illinois) describes the so-called Anthropic Principle that some invoke to answer the "fine tuning problem" of cosmology.
Curated Video
Fingernails on the Chalkboard
University of Chicago cosmologist Rocky Kolb relates how he reacts very differently to dark matter than dark energy: dark matter he regards as an opportunity, while dark energy "drives him nuts".
Curated Video
Planet Earth is TINY Compared To The Universe! | The Scale Of The Universe Song | KLT
Let's learn about how BIG the universe is!
Curated Video
The Electromagnetic Radiation Spectrum
This video will explain the electromagnetic radiation spectrum, what it is, and how it can be used to observe space objects.
Curated Video
Universe Size Comparison Video | Space Explained by KidsLearningTube
Learn about Universe Size Comparison with this facts about the universe video. Brought to you by KLT!
Curated Video
Five States of Matter
“Five States of Matter” explores the three common states of matter, as well as the two other lesser-known types, and provides examples of each
Curated Video
Formation of the Planets
“Formation of the Planets” uses the nebular hypothesis to explain how the planets in our solar system developed.
Hip Hughes History
Jainism 101: Religions in Global History
A short overview of Jainism. Please support the World History Playlist!
Curated Video
Is Mathematics INVENTED or DISCOVERED?
The tale of mathematics is as old as humanity. It has evolved from simple math, like counting cattle, to an intricate study of an object through abstract concepts that we know today. It was not until 600 BC, when civilizations settled,...
Curated Video
Boltzmann Brain Paradox Explained in Simple Words
A Boltzmann brain is not real, but what’s fascinating about it is that it thinks it’s real, and all the memories and experiences it has are real. But, of course, this brain is not real. But how would such a brain know that its memories...
Vlogbrothers
How Big is the Universe?
In which Hank explains how and why phycisists think that the univers has no edge.
Vlogbrothers
Aliens
Is it aliens? Probably not. Why? Because we don't know almost everything, and finding an explanation that could explain almost anything doesn't recognize that there is a whole lot we don't know. We are so extremely biased toward thinking...