/sci/ - Science & Math

some reconstructions have dark skin

these reconstructions look not very different from modern people

>>7946278
>human/ neanderthal breeding
it's certainly cross-species

Neanderthal features?

← reconstruction at museum

>analysis of genetic information indicated
>at least four interbreeding episodes,
>three with the Neanderthals,
>and one with the Denisovans
Reuters on Friday
http://www.reuters.com/article/us-science-interbreeding-idUSKCN0WK2SN

Reuters article says methane in Martain atmosphere could be produced by geological phenomena, such as the oxidation of iron. How could oxidation of iron produce methane?
http://www.reuters.com/article/us-space-exomars-idUSKCN0WG0VA

error less than one-half part per quadrillion:
[math] \displaystyle \frac{355}{113} \left ( 1- \frac{0.0003}{3533} \right )[/math]

Wiki shows reflective radiation pressure is
[math]P_{reflect}= \frac{2W}{cR^2} \cos^2 \alpha[/math] Pascals, where
solar constant W = 1361watt/m2
speed of light c = 3e8 m/s
R = distance from Sun in AU
α = incident angle
so your one-hectare reflector near Venus (0.72AU) at a 45° angle (for tangential acceleration) would give 123milliNewton force.

>>7750077
engineers are people who work on engines
Lrn2engine

>>7750063
>every instrument detects particles
... except the interferometer, which detects waves.

This thread prompted me to look into
[math]\displaystyle \frac{1}{k~log(k)}[/math]
and discover that Wolfram's "comparison test" is a comparison to the integral, which I've always knows as the "integral test". Am I behind the curve, or is Wolfram retarded?

>>7748550
>what do i say?
Say that "we" do not assume anything, that "we" have learned about memory from the past hundred years of cognitive neuroscience, from which "we" have no reason to think the universe has a collective memory somewhere.

volume is just
[math]\displaystyle V= \frac{1}{3}hA_f = \frac{1}{3} \sqrt{ \frac{2}{3}} \times \frac{ \sqrt{3}}{4}= \frac{ \sqrt{2}}{12}[/math]

mathJax is being very tedious today
height of the tetrahedron
[math]\displaystyle h= \sqrt{1^2- \left ( \frac{ \sqrt{3}}{3} \right )^2}= \sqrt{ \frac{2}{3}}[/math]

height of the tetrahedron
[math]\displaystyle h= \sqrt{1^2- \left ( \frac{\sqrt{3}}{3} \right )^2}= \sqrt{\frac{2}{3}}[math]

height of tetrahedron
[math]\displaystyle h= \sqrt{1^2-\left ( \frac{\sqrt{3}}{3} \right )^2}= \sqrt{\frac{2}{3}}[math]

mathJax is being weird today
[math]\displaystyle A= \frac{1}{6}A_f= \frac{\sqrt{3}}{24} = \frac{1}{2} \times \frac{1}{2} \times d= \frac{1}{4}d[/math]
so [math]\displaystyle d= \frac{\sqrt{3}}{6}[/math]

mathJax is being weird today
[math]\displaystyle A=\frac{1}{6}A_f=\frac{\sqrt{3}}{24} =\frac{1}{2} \times \frac{1}{2} \times d=\frac{1}{4}d[/math]

area of one face
[math][math]\displaystyle A_f= \frac{1}{2} \times 1 \times \frac{ \sqrt{3}}{2}= \frac{ \sqrt{3}}{4}[/math][/math]

area of one face
[math]\displaystyle A_f=\frac{1}{2}\times 1\times \frac{\sqrt{3}}{2}=\frac{\sqrt{3}}{4}[/math]

altitude of one face
[math]\displaystyle a=\sqrt{1^2-\left ( \frac{1}{2} \right )^2}=\frac{\sqrt{3}}{2}[/math]

>>7717486
No mistake, it's correct.
>>7720087

>>7718958
It's correct, I'll make a diagram for how to obtain it, and post it later.