Quote from: chris
They gave me an instant headache, especially the second one...A very short incubation period...
At least this version of ebola doesn't kill you.
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Why don't textbooks show DNA with its hydrating water?1. Because the chapter title is "DNA", not "Water" or "Hydrogen Bonding"
Can mass ejection from a remote supernova reach the Earth?In one sense, the heavy elements making up the Earth were created in a series of supernova events. So yes, the mass ejected from remote supernova has reached the Earth, about 5 billion years ago.
The remnant of the star is called the crab nebula, it is 6,500 light years away and was recorded as a supernova in 1054 by Chinese astronomers.For remnants of the crab nebula to have reached Earth by 2017, the debris would have had to travel at 85% of the speed of light.
...our nearest star. I read it is a red dwarf with small rock planets in the habitable zone that contain water. After the red giant phase...Proxima Centauri is a red dwarf because it has a very low mass - about 1/8 the mass of the Sun. This means Proxima is burning its hydrogen fuel very slowly, and it will still be glowing long after the Sun has passed the red giant phase and turned into a dark cinder.
Since time slows down at the event horizon of each black hole shouldn't it take an infinite amount of time for the process to conclude?Let's have a look at the amount of time dilation expected as two black holes merge (simple approximation*):
I believe modern psychiatry is using schizophrenia as a way to label psychiatric symptoms of remote neural monitoring caused by pulsed microwave radiation.Perhaps modern schizophrenia sufferers are using "remote neural monitoring caused by pulsed microwave radiation" as a way to label psychiatric symptoms?
since inf is not a numberMost modern computers use IEEE Floating point, and have an explicit representation for infinity, which is returned if you do 1/0.
The representation of numbers with infinite decimals are incomplete, and truncated out of necessityThis is talking about finite pieces of paper, or computers with a finite number of bits.
Mathematically speaking, the point is the difference between a limit and an equality.I know they make a big fuss about this distinction in high school, but the fact that calculus works at all is because in many useful cases, the there is no difference between the limit and the exact value (chaotic and fractal systems fail this test, which is one reason they are so hard to analyze).
particle and antiparticle must have:See: https://en.wikipedia.org/wiki/Antiparticle#Properties
- the same mass m
- the same spin state J
- opposite electric charges q and -q.
I suspect that the energy density would not be that greatThere is enough on the geometry of the spring to estimate that the spring would take up a volume of 5 liters, have a unrolled length of 3m and a mass of 9.5kg (if I've done the calculations correctly!).
Does the propagational velocity of gravitational waves vary with extreme curvature of spacetime?If (as most physicists expect), gravitons are massless (just like photons):
If gravitons interact with each other in the same way that gluonsIf massless gravitons interact with each other in the same way as massless photons, then they will travel through space at c.
There is an old Arab Bedouin saying: "I, against my brothers. I and my brothers against my cousins. I and my brothers and my cousins against the world." That is jungle law. It is the way of the world when the world is thrown into chaos. It is our job to avert that chaos, to fight against it, to resist the urge to become savage. Because the problem with such law is that if you follow it, you are always fighting against someone.In nature, "The Selfish Gene" often expresses itself as "The Selfish Individual" and "The Selfish Family".
red giant ProximaProxima Centauri is a red dwarf with a mass about 1/8 the mass of the Sun, and 0.1% as bright as the Sun. This makes it too big to be a planet.
which the other two rotateAlpha Centauri A & B have a combined mass of about 2 times the mass of the Sun; their orbital period is 80 years.
If the light from Proxima contains no absorption linesSee here for an absorption spectrum of Proxima Centauri. You can visit the host page for more details.