Everyone is feeling the Cosmos vibe.
New but old watch. Vintage SEIKO 5 1970s.
Carl Sagan’s famous ‘star stuff’ quotation takes a simple scientific fact and gives it a uniquely poetic sound. In the earliest universe, after the Big Bang, the only elements to be found were hydrogen and helium. These, of course, came together to form stars, giant nuclear fusion reactors that combined hydrogen atoms to make even more helium. As stars get more massive, they gain the ability to fuse this helium into heavier atoms like carbon, nitrogen, sulfur, etc. up until they reach iron.
Iron is a crucial element in nuclear fusion as it is the lightest element encountered where the energy input needed to fuse it is greater than the energy output of the reaction—ultimately triggering a gravitational collapse in the stars leading to a supernova. This extremely brief gravitational collapse before the supernova is the only time when stars can create elements heavier than iron, explaining why precious metals such as gold and silver are so rare in nature.
The supernova that occurs at the death of these massive stars allows them to disperse all of the elements that they have fused in their lifetimes into space, allowing for the formation of planets such as Earth and everything on them. It is in the hearts of the stars that our atoms were forged and in their dying gasps that these atoms were released into the universe to ultimately end up on this planet for our bodies to use.Neil deGrasse Tyson will pick up where Carl Sagan left off, distilling complex scientific ideas into a digestible form as he hosts the reboot of COSMOS.Watch the trailer for COSMOS: A Space-Time Odyssey: http://bit.ly/COSMOS-Sequel
Watch Cosmos on Fox, March 9th at 9/8c
“There is no other species on the Earth that does science. It is, so far, entirely a human invention, evolved by natural selection in the cerebral cortex for one simple reason: it works. It is not perfect. It can be misused. It is only a tool. But it is by far the best tool we have, self-correcting, ongoing, applicable to everything.” -Carl Sagan
HOW INFORMATION TRAVELS IN A CELL AND BETWEEN CELLS
Scientific Illustration by Nicole Rager Fuller / Sayo Studios, 2014
- The key components of genetics: chromosomes, DNA, RNA, and protein production.
- Cell Signaling and Drug Action
- Growth factors (the blue and purple spheres) bind to certain receiving proteins, called receptors, which relay the growth factor signals into the cell. These signals are further relayed through a large network of proteins by kinases, which eventually change the activity of genes within the nucleus.
- Cell signaling is the process used by cells to communicate with other cells. Signals (hormones, growth factors, calcium, nitric oxide, etc.) originate in a cell, leave, and then enter and are interpreted by another cell.
- The protein production process in an animal cell, from transcription and translation, to the folding of amino acids into functional proteins.
(via DNA and Genetics)
I just can’t get over the emotion evident on his face here.
To think that…when he visited Carl in his office at Cornell as an applicant and Carl reached back, grabbed one of his books, signed it, and handed it to him…that one day, all too soon, Carl would be gone. And that he, Neil, would be called upon to host a Cosmos reboot.
Oh, the feels, the feels, the sciencey feels!
Cobra & Scorpion alchohol. Yum.