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The Cool Science Stuff Thread

http://66.media.tumblr.com/77c85a1821caef704bfcf28d6d7b2b4c/tumblr_oc44c9Uiz71tedol3o1_500.gif

This is a homopolar motor.

It’s really easy to experiment with at home. It is driven by the Lorentz force - the force which is exerted by a magnetic field on a moving electric charge. When a battery is placed on top of a magnet, and a wire then connects the top of the battery back down to the magnet, the circuit is complete.

Students in our Summer Schools were making these the other day. This one won the ‘most creative design’ competition.


SOURCE
 
http://67.media.tumblr.com/8bb1ea3be06f722eb9c16851e8df3283/tumblr_ocs2b72oLH1qckzoqo2_540.gif

http://67.media.tumblr.com/00fcf6efacaed266ee0674e06964ba71/tumblr_ocs2b72oLH1qckzoqo1_500.gif

The animations above show a little of what happens when you pour a spoonful of liquid nitrogen onto a container of gasoline. A couple of things are happening simultaneously here. First of all, the liquid nitrogen is experiencing the Leidenfrost effect. Because of the extreme difference in temperature between the gasoline (~20 degrees C) and the liquid nitrogen (-196 degrees C), part of the nitrogen is evaporating immediately, creating a vapor layer that insulates the remainder of the liquid nitrogen and allows it to float above the gasoline surface. The same thing happens to water drops on a very hot skillet.

The extreme cold of the nitrogen also seems to have formed some ice that’s further protecting the nitrogen drop. I’m not 100% sure what that would be made of, though – a mixture of water and gasoline?

Finally, there’s the simultaneous evaporation of the liquid nitrogen and the sublimation of the ice. This is the white vapor we see propelling and spinning the ice/drop. Note the “bounce” that happens in the top animation. The drop never actually impacts the wall. When it gets close, the escaping vapors are affected by the wall and start pushing the drop in a new direction! Check out the whole video below.

VIDEO


SOURCE
 
phrodeau said:
A claim is made that fossil stromatolites in Greenland are the oldest discovered at 3.7 billion years. This tops Australia's stromatolite fossils, dated at 3.48 billion years, and puts it in the time before there was chlorophyll and atmospheric oxygen.

http://www.bbc.com/news/science-environment-37235447
Click to expand...

Xfrodobagginsx will disagree with you since that goes against his reality of the world being created 6,000 years ago.
 
Mello_SixtyNine said:
Xfrodobagginsx will disagree with you since that goes against his reality of the world being created 6,000 years ago.
Click to expand...
The Book of Genesis does not relate when stromatolites first appeared, so it could have been 3.7 billion years ago without contradicting anything. Genesis also tells us that plants and trees were being fruitful and multiplying before the sun was created, so why not?
 
http://arstechnica.com/science/2016...ead-ancient-biblical-text-for-the-first-time/

A new science, dubbed "volume cartography", allows data from a micro-CT scan of an ancient scroll to be converted to a flat image that can then be read without unrolling the scroll.

For a demonstration, one of the En-Gedi scrolls, severely damaged by fire, was read for the first time. It turned out to be a passage from Leviticus, concerning burnt offerings.

http://cdn.arstechnica.net/wp-content/uploads/2016/09/unwrappedscroll.png
 
Scripps Scientists Discover new Fault Under Salton Sea

http://timesofsandiego.com/tech/2016/10/05/scripps-scientists-discover-fault-along-salton-sea/


Further research will help provide information about how the newly identified fault interacts with the southern San Andreas Fault. That could lead to more understanding of the more than 300-year period since the most recent large temblor.

“The extended nature of time since the most recent earthquake on the Southern San Andreas has been puzzling to the earth sciences community,” said Nevada State Seismologist Graham Kent, a co-author of the study and former Scripps researcher.

“Based on the deformation patterns, this new fault has accommodated some of the strain from the larger San Andreas system, so without having a record of past earthquakes from this new fault, it’s really difficult to determine whether this fault interacts with the southern San Andreas Fault at depth or in time,” Kent said.
 
New 'dwarf' planet found
It's 14 billion km from Sol and only 330 miles across, which is smaller than Ceres.
For that reason, object 2014 UZ224 may not retain its status as a dwarf planet.

The really cool part is that it was found using the Dark Energy Camera, which was built to study 'dark energy'.
 
http://www.cbc.ca/news/canada/north/terror-discovery-franklin-expedition-more-questions-1.3793820

'It just got much more complicated': Why the discovery of HMS Terror only raises more questions

Mystery still surrounds what happened after the Franklin Expedition ships were abandoned in 1848

Even though HMS Terror has been found, the wreck's discovery in no way marks the end of the mystery surrounding how the Franklin Expedition met its grim demise in the mid-19th century in the icy waters of what is now Nunavut. As much as its location had been long sought, the wreck's revelation last month only serves up more questions about the ill-fated British polar mission led by John Franklin in search of the elusive Northwest Passage.

HMS Terror was found in the appropriately named Terror Bay, off the shore of King William Island, about 100 kilometres north of the wreck of the other ship lost in the Franklin Expedition, HMS Erebus.

While the wreck of Erebus is somewhat exposed to the underwater elements in Wilmot and Crampton Bay, the relatively pristine nature of the Terror wreck is especially tantalizing for those who have been pursuing the Franklin mystery for years. The possibility that artifacts inside might be well-preserved holds out hope that researchers could learn more about how the expedition met its end.
It's certainly not where they had been looking for several years, with efforts concentrated further north in Victoria Strait.

According to a note left by the expedition crew in a cairn on King William Island, HMS Erebus and HMS Terror were trapped in ice in 1846 and abandoned two years later off the island in Victoria Strait, a place north of where Terror was found.
The vagaries of the northern location and its extreme weather mean a limited season each year for open water exploration around the wreck sites — just a few weeks in August and September. Erebus poses a further challenge because of the wreck's instability.

Terror is in slightly deeper water, seems less threatened and more intact. And maybe that means somewhere deep inside, there are ship's logs or other documents tightly rolled up in a tin that has been soldered shut that could offer insight into what exactly happened to the expedition and its 128 crewmen led by Franklin.
 
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