The story so far:
In the beginning the Universe was created.
This has made a lot of people very angry and has been widely regarded as a bad move.
It is known that there are an infinite number of worlds, simply because there is an infinite amount of space for them to be in. However, not every one of them is inhabited. Therefore, there must be a finite number of inhabited worlds. Any finite number divided by infinity is as near to nothing as makes no odds, so the average population of all the planets in the Universe can be said to be zero. From this it follows that the population of the whole Universe is also zero, and that any people you may meet from time to time are merely the products of a deranged imagination.
Notes: 4600 / 6 hours ago
from physicistsneedlovetoo (originally from nubbsgalore)
circumhorizontal arcs photographed by (click pic) david england, andy cripe, del zane, todd sackmann and brandonrios. this atmospheric phenomenon, otherwise known as a fire rainbow, is created when light from a sun that is at least 58 degrees above the horizon passes through the hexagonal ice crystals that form cirrus clouds which, because of quick cloud formation, have become horizontally aligned. (see also: previous cloud posts)
Notes: 21673 / 1 day ago
from afro-dominicano (originally from socialismartnature)
at around 13.2 degrees Celsius, β-form white tin transforms to α-form grey tin due to tin pests (or tin disease). The transformation process requires high activation energy but very low temperatures and the presence of Germanium can aid in initiation.
Do you ever see something that just makes you physically uncomfortable?
oh my god this is really cool, i just looked into it
the beta form is metallic, and the alpha form is an octahedral covalent network (the same as diamond, in case you were wondering)
it’s a self-catalyzed direct transformation from a metallic to crystal substance!
also, since this reaction only takes place and low temperatures, and based on the fact that it’s forming a crystal, it likely has a negative change in entropy. (i couldn’t find an actual delta-s value, but there’s not much else it could be but negative.)
a self-catalyzed reaction which reduces entropy. neato.
edit: found it! ΔH°=-2.03 kJ/mol and ΔS°=-7.1 J/mol°K. yep, negative entropy and exothermic.
Tin Pest is also very historically important. Turns out sending your soldiers into Russia with tin buttons is a terrible idea.
So often around stairs and similar places you have a single light that can be operated by a switch both at the bottom, and the top. If you’ve ever wondered how you can make this work, it’s actually quite simple!
The first gif shows a functional schematic for the circuit, while the second gif demonstrates the simplest version that you too could make at home, to see how it works for yourself, or share with an enthusiastic child.
If you want more information, click the title for a video on how it all works!
So I got this in the post today, much to my surprise. The cover letter didn’t explain too much and so I searched my uni website, and it turns out that out of about 5000 students this gets awarded to 72 1st and 2nd year students, for achieving the highest year average grade in each STEM degree.
So I’m really rather proud of that.
Oh, and it also came with a cheque for £1000 which is absolutely insane.
Thank you very much for the money BP, but I’m still not gonna work for you.
Just finished making my costume for pirate day. With some creativity I managed to modify the shirt and trousers, and make the sash, necklace and sword for about £15 and 8-ish hours of cutting, sewing, mod-rocking, painting, wireworking, burning and drilling.
Ever wondered how house lights with two different switches work? Here’s how!
You often find these types of switches for stairwell lights, where you can turn them on or off in two different locations. They don’t work quite the same as a normal switch, but it’s still fairly simple.
You can also quite easily make a small scale model for yourself at home if you want to have a play around with it.
Notes: 2308 / 6 days ago
from scinerds (originally from currentsinbiology)
In a survey of scientists engaged in field research, the majority — 64 percent — said they had personally experienced sexual harassment while at a field site, and 22 percent reported being the victim of sexual assault.
Most of the people reporting harassment or assault were women, and the vast majority were still students or postdocs.
And for female victims, the perpetrator was more likely to be a superior, not a peer. “This is happening to them when they are trainees, when they are most vulnerable within the academic hierarchy,” says evolutionary biologist Katie Hinde , an author on the study in PLOS ONE. Hinde and her colleagues say this could be a factor in the large number of women who enter scientific fields but don’t continue.
Students work at an archaeological dig near Silchester, England.
Notes: 665 / 1 week ago
from sciencejokes (originally from asapscience)
David Cameron’s new minister of state for science has drawn criticism online for his past support of the widely-discredited pseudo science of homeopathy.
Greg Clark MP, whose full title is Minister of State for Universities, Science and Cities, was among 206 MPs in 2007 who signed an early-day motion that “welcomes the positive contribution made to the health of the nation by the NHS homeopathic hospitals”.
So today in the UK we’ve had a ‘cabinet reshuffle’, which is where the Prime minister reorganises the top members of their party. Essentially it seems to involve a bunch of old rich white men swapping jobs with each other, none of which seem relevant to their life experiences.
As such we end up with situations like the new science minister having publicly signed for the introduction of homeopathy into the country’s health service.
While homeopathy may cause the placebo effect in some cases and therefore be an effective way of treating non-serious short term conditions, it could be dangerous to allow scientifically rejected ideas of medicine enter common practice.
This happened in 2007, so there is the possibility that he has since changed his position. This remains to be seen during his time in this position.
Once upon a time, a scientist named Dr. Andrew Wakefield published in the medical journal The Lancet that he had discovered a link between autism and vaccines. After years of controversy and making parents mistrust vaccines, along with collecting $674,000 from lawyers who would benefit from suing vaccine makers, it was discovered he had made the whole thing up. The Lancet publicly apologized and reported that further investigation led to the discovery that he had fabricated everything.