Watch zebrafish cells chase each other into patterns!

An amazing article from Ed Yong describes a new mechanism for pattern formation:

Coloured Cells Chase Each Other To Make A Fish’s Stripes

Zebrafish patterns aren’t just controlled by a chemical reaction-diffusion mechanism — the pigment cells actually chase each other! The different color cells sort themselves into stripes, spots, or other patterns depending on their relative speeds.

wetwareontologies:

A new project to create a life-like simulation of Caenohabditis elegans (pictured above), a roundworm. OpenWorm isn’t like these other initiatives; it’s a scrappy, open-source project that began with a tweet and that’s coordinated on Google Hangouts by scientists spread from San Diego to Russia. If it succeeds, it will have created a first in executable biology: a simulated animal using the principles of life to exist on a computer.

dvdp:

Today’s Smile by qubibi

<meta property=“og:description” content=
This is a website I created after being affected by the 3.11 Earthquake in Japan,
and the nuclear power plant incidents that followed.”

/>

UPDATE 2012-02-05
Shortly after I’ve posted this The Daily Dot wrote more about
qubibi (Kazumasa Teshigawara), the process and emotions behind this work.

An example of Optical feedback

Image source: http://en.wikipedia.org/wiki/File:Optical-feedback-2-short.gif

image

An electromagnetic wave bootstraps itself through the void

Image 1: Source: Wikipedia article on “Electromagnetic radiation” (image source; cc-by-sa)

Caption: “Electromagnetic waves can be imagined as a self-propagating transverse oscillating wave of electric and magnetic fields. This 3D diagram shows a plane linearly polarized wave propagating from left to right.”

image

Image 2: Source: Wikipedia article on “Electromagnetic radiation” (image source; cc-by-sa)

Caption: “This 3D diagram shows a plane linearly polarized wave propagating from left to right. Note that the electric and magnetic fields in such a wave are in-phase with each other, reaching minima and maxima together.”

 image

Image 3: Source: Wikipedia article on “Electromagnetic radiation” (image source; cc-by-sa)

Caption: “The electromagnetic waves that compose electromagnetic radiation can be imagined as a self-propagating transverse oscillating wave of electric and magnetic fields. This diagram shows a plane linearly polarized EMR wave propagating from left to right. The electric field is in a vertical plane and the magnetic field in a horizontal plane. The two types of fields in EMR waves are always in phase with each other with a fixed ratio of electric to magnetic field intensity.”

– – – – – – – – – – – – – – –

If compression waves, like sound, need to travel through a carrier medium, then how can electromagnetic waves propagate themselves through empty space?


A photon acts a little like the Glider in Conway’s Game of Life: at each step, it creates the conditions for the next step. Now, this is just one way of viewing an electromagnetic wave, and far from complete. But it’s interesting to think about!

More quotes from Wikipedia:

“Similar to the way that a changing magnetic field generates an electric field, a changing electric field generates a magnetic field. This fact is known as Maxwell’s correction to Ampère’s law. Maxwell’s correction to Ampère’s Law bootstrap together with Faraday’s law of induction to form electromagnetic waves, such as light. Thus, a changing electric field generates a changing magnetic field, which generates a changing electric field again.”

(Source: Wikipedia article on “Magnetic field”)

“A common misconception is that the E and B fields in electromagnetic radiation are out of phase because a change in one produces the other, and this would produce a phase difference between them as sinusoidal functions (as indeed happens in electromagnetic induction, and in the near-field close to antennas). However, in the far-field EM radiation which is described by the two source-free Maxwell curl operator equations, a more correct description is that a time-change in one type of field is proportional to a space-change in the other. These derivatives require that the E and B fields in EMR are in-phase (see math section below).”

(Source: Wikipedia article on “Electromagnetic radiation”)

And it gets weirder: 

According to the special theory of relativity, the partition of the electromagnetic force into separate electric and magnetic components is not fundamental, but varies with the observational frame of reference: An electric force perceived by one observer may be perceived by another (in a different frame of reference) as a magnetic force, or a mixture of electric and magnetic forces.

Formally, special relativity combines the electric and magnetic fields into a rank-2 tensor, called the electromagnetic tensor. Changing reference frames mixes these components. This is analogous to the way that special relativity mixes space and time into spacetime, and mass, momentum and energy into four-momentum.”

(Source: Wikipedia article on “Magnetic field”)

More animations from this Wikimedia gallery of animations from Conway’s Game of Life!

Pulsar (period 3)

Another 3-period oscillator

8-period oscillator

This one’s also really cool, but it’s not uploading for some reason

Again, had it in a folder so long I lost the source. Any suggestions?

EDIT: Saw it credited to www.users.math.umd.edu/~wphooper/frac/frac6.gif but the link doesn’t work… so probably made by W Patrick Hooper, who did his undergrad at UMD: http://wphooper.com/

That UMD Experimental Geometry Lab has some pretty sweet math images too: http://egl.math.umd.edu/projects-archive.html

Awww but the combined one is sooo much better! http://r0m1n.minus.com/ly92QXzZkU2Wx … dang file-size limit

Glasses of Nerdicon, from Adventure Time episode “The Real You”

http://adventuretime.wikia.com/wiki/Glasses_of_Nerdicon

four-part gif via sugarlessponygum

bouncingdodecahedrons:

“We humans long to be connected with our origins, so we create rituals. Science is another way to express this longing. It also connects us with our origins, and it too has its rituals and its commandments. Its only sacred truth is that there are no sacred truths. All assumptions must be critically examined. Arguments from authority are worthless. Whatever is inconsistent with the facts, no matter how fond of it we are, must be discarded or revised. Science is not perfect, it’s often misused, it’s only a tool, but it’s the best tool we have. Self-correcting, ever-changing, applicable to everything. With this tool we vanquish the impossible. With the methods of science we have begun to explore the cosmos.” – Carl Sagan

Love the line art animation, but… is that a hydra turning into a urochordate tadpole larva?

Ignacio Torres, Stellar
“This project began from the theory that humans are made of cosmic matter as a result of a stars death. I created imagery that showcased this cosmic birth through the use of dust and reflective confetti to create galaxies. The models organic bodily expressions as they are frozen in time between the particles suggest their celestial creation. In addition, space and time is heightened by the use of three-dimensional animated gifs. Their movement serves as a visual metaphor to the spatial link we share with stars as well as their separateness through time.”
http://ignacio-torres.com/projects/stellar/