In 1967, at the Ebenezer Baptist Church in Atlanta, Georgia, Martin Luther King spoke with NBC News' Sander Vanocur about the "new phase" of the struggle for "genuine equality."
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MLK Talks 'New Phase' Of Civil Rights Struggle, 11 Months Before His Assassination | NBC News

Learning more about the current state of Honduras. My Instagram: https://www.instagram.com/indigo.traveller/
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Thanks for watching!

Physicist Brian Greene takes you on a visual, conceptual, and mathematical exploration of Einstein’s spectacular insights into space, time, and energy. In just 11.5 hours, using nothing more advanced than high school algebra, journey from Einstein’s earliest musings on the speed of light to his startling realization that time can tick at different rates to his revolutionary discovery of the world’s most famous formula, E = mc2.

This is a more in-depth and mathematical version of the WSU Master Class “Space, Time, and Einstein.” https://youtu.be/CKJuC5CUMgU

#WorldSciU

Watch the class in full or view in segments via the chapter links below.

Experience the associated free online course at World Science U: https://worldscienceu.com/cour....ses/special-relativi

0:00 - Introduction
01:43 - Scale
05:46 - Speed
18:19 - The Speed of Light
27:39 - Units
33:28 - The Mathematics of Speed
44:24 - Relativity of Simultaneity
54:25 - Pitfalls: Relativity of Simultaneity
1:03:32 - Calculating the Time Difference
1:18:42 - Time in Motion
1:28:48 - How Fast Does Time Slow?
1:46:32 - The Mathematics of Slow Time
1:57:11 - Time Dilation Examples
2:10:51 - Time Dilation: Experimental Evidence
2:19:58 - The Reality of Past, Present, and Future
2:34:01 - Time Dilation: Intuitive Explanation
2:37:57 - Motion's Effect On Space
2:55:11 - Motion's Effect On Space: Mathematical Form
3:00:47 - Length Contraction: Travel of Proxima Centauri
3:07:46 - Length Contraction: Disintegrating Muons
3:12:00 - Length Contraction: Distant Spaceflight
3:18:54 - Length Contraction: Horizontal Light Clock In Motion
3:27:17 - Coordinates For Space
3:36:37 - Coordinates For Space: Rotation of Coordinate Frames
3:48:36 - Coordinates For Space: Translation of Coordinate Frames
3:53:10 - Coordinates for Time
4:07:12 - Coordinates in Motion
4:26:08 - Clocks in Motion: Examples
4:35:02 - Clocks in Motion: Length Expansion From Asynchronous Clocks
4:38:42 - Clocks in Motion: Bicycle Wheels
4:45:01 - Clocks in Motion: Temporal Order
4:54:35 - Clocks in Motion: How Observers Say the Other's Clock Runs Slow?
5:08:50 - The Lorentz Transformation
5:16:52 - The Lorentz Transformation: Relating Time Coordinates
5:26:10 - The Lorentz Transformation: Generalizations
5:33:18 - The Lorentz Transformation: The Big Picture Summary
5:47:37 - Lorentz Transformation: Moving Light Clock
5:54:39 - Lorentz Transformation: Future Baseball
6:02:35 - Lorentz Transformation: Speed of Light in a Moving Frame
6:08:43 - Lorentz Transformation: Sprinter
6:10:44 - Combining Velocities
6:17:46 - Combining Velocities: 3-Dimensions
6:27:45 - Combining Velocities: Example in 1D
6:30:23 - Combining Velocities: Example in 3D
6:36:34 - Spacetime Diagrams
6:50:35 - Spacetime Diagrams: Two Observers in Relative Motion
7:01:16 - Spacetime Diagrams: Essential Features
7:11:42 - Spacetime Diagrams: Demonstrations
7:15:23 - Lorentz Transformation: As An Exotic Rotation
7:27:26 - Reality of Past, Present, and Future: Mathematical Details
7:39:00 - Invariants
7:43:55 - Invariants: Spacetime Distance
7:54:25 - Invariants: Examples
7:59:19 - Cause and Effect: A Spacetime Invariant
8:12:40 - Cause and Effect: Same Place, Same Time
8:22:37 - Intuition and Time Dilation: Mathematical Approach
8:29:46 - The Pole in the Barn Paradox
8:43:51 - The Pole in the Barn: Quantitative Details
9:04:43 - The Pole in the Barn: Spacetime Diagrams
9:08:25 - Pole in the Barn: Lock the Doors
9:20:50 - The Twin Paradox
9:29:28 - The Twin Paradox: Without Acceleration
9:46:34 - The Twin Paradox: Spacetime Diagrams
9:53:12 - Twin Paradox: The Twins Communicate
10:06:34 - The Relativistic Doppler Effect
10:19:00 - Twin Paradox: The Twins Communicate Quantitative
10:30:17 - Implications of Mass
10:40:06 - Force and Energy
11:00:12 - Force and Energy: Relativistic Work and Kinetic Energy
11:07:24 - E=MC2
11:26:28 - Course Recap

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Probability is the examination of uncertain processes, but it's useful for far more than games of chance: http://www.gresham.ac.uk/lectu....res-and-events/proba

The modern theory of probability is considered to have begun in 1654 with an exchange of letters between Blaise Pascal and Pierre de Fermat, and has developed since then into the discipline which examines uncertain processes. For example, although on tossing a coin you have no idea whether you will obtain heads or tails we know that if you keep doing it then in the long run it is very likely that the proportion of heads will be close to a half. The lecture will discuss this and other examples of random processes e.g. random walks and Brownian motion.

The transcript and downloadable versions of the lecture are available from the Gresham College website: http://www.gresham.ac.uk/lectu....res-and-events/proba

Gresham College has been giving free public lectures since 1597. This tradition continues today with all of our five or so public lectures a week being made available for free download from our website. There are currently over 1,500 lectures free to access or download from the website.
Website: http://www.gresham.ac.uk
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Robbert Dijkgraaf, Perimeter Institute for Theoretical Physics
March 5th, 2014

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Mathematics has proven to be "unreasonably effective" in understanding nature. The fundamental laws of physics can be captured in beautiful formulae. In this lecture I want to argue for the reverse effect: Nature is an important source of inspiration for mathematics, even of the purest kind. In recent years ideas from quantum field theory, elementary particles physics and string theory have completely transformed mathematics, leading to solutions of deep problems, suggesting new invariants in geometry and topology, and, perhaps most importantly, putting modern mathematical ideas in a `natural’ context.
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visit Perimeter Institute's website to find this and other speakers

http://www.perimeterinstitute.ca/video-library

http://pirsa.org/

Black holes may hold the key to understanding the most fundamental truths of the universe, but how do you see something that’s, well, black? Astronomers think they have the answer. Thanks to a global array of radio telescopes that turn the Earth into a giant receiver, we may soon have the first picture of the event horizon of Sagittarius A*, the black hole at the center of the Milky Way galaxy. And, with the power of math, scientists are going even further, using equations to “look” inside black holes, peering at the central singularity where general relativity and quantum mechanics collide. Join Brian Greene and other leading physicists and astronomers on a journey to make darkness visible.

Find out more about the program and the participants: https://www.worldsciencefestiv....al.com/programs/dark

MODERATOR: Brian Greene
PARTICIPANTS: Shep Doeleman, Andrea Ghez, Vicky Kalogera, Cumrun Vafa

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The Big Ideas Series is supported in part by the John Templeton Foundation.

Filmed live at the 2018 World Science Festival