RegularGuest

A good chunk of our genome is highly conserved. Areas that encode key protein production are basically the same in me as they are in you. Let's call the percentage of the genome that is highly conserved C%. Then if we mate the true variation that we pass on is (1 - C%) / 2 which is less than 50% and conversely the amount that we share with our offspring is 1 - (1 - C%) / 2 or 1/2 + C% which is greater than 0.5

Wikipedia has the following question regarding sexual selection:

Why sexual reproduction exists, if in many organisms it has a 50% cost (fitness disadvantage) in relation to asexual reproduction?[7]

Given what I wrote above this question is not quite correct, right?

On to a

Hello r/space,

I cannot seem to find projected costs for space tourism over the next 20 years. The part of space tourism I am most interested in is >1 day trip to space. I see flights to the ISS are about $50mm while suborbitals are going for around $100k give or take. Is there something in between and what are realistic cost projections for such a trip over the next 20 years? Thanks for any help you can give!

Hi r/math,

This might be the wrong sub but I was hoping someone could point me to either, an equation that draws a turkey in Wolfram, or resources to teach me how to do it myself. I've seen people create the reddit alien as a series of parametric equations and was wondering if there was a tool to help. Thanks!

Trying to re-derive equations of geometric series on the train and found a couple neatish identities. There's a good chance you've seen this in a text book but anywho....

First a couple definitions

Let 0 < x < 1

Regular Geometric series infinite : Gir(x) = 1 + x + x^2 + x^3 + ...

Regular Geometric series finite : Gnr(x) = 1 + x + x^2 + ... + x^(n-1)

Ascending Geometric series infinite : Gia(x) = 1 + 2x + 3x^2 + ...

Ascending Geometric series finite : Gna(x) = 1 + 2x + 3x^2 + ... + nx^(n-1)

Identity 1: Gia(x) = Gir(x)^2

Identity 2: Gna(x) = Gir(x)^2 * (1 - nx^n ) = Gia * (1 -nx^n )

as you may know the trick to finding a closed expression of Gir(x) is such.

Gir(x)

My knowledge of a black hole isn't rigorous so it might be just ignorance here.

Here are the two viewpoints: "A" the photon passing through the event horizon; and "B" outside observer

"A" falls towards the black holes event horizon. Relativity says that from "A"s perspective the rest of the universe starts to speed up towards infinity.

"B" sees "A" fall through the event horizon.

Problem: Since black holes evaporate due to Hawking Radiation at some time the information/energy content of the photon is released away from the black hole. However, since "A" sees the universe speeding towards infinity, "A" knows that "B" must have seen it evaporate at some point. However "B" saw the photon

http://research.microsoft.com/en-us/um/people/leino/puzzles.html#Catching%20a%20spy

Here is my strategy.

Pick a random integer.

Step 1: Move 1! to the right, Check that spot 1! times, move 1 to the right

Step 2: Move 2! to the left, check that spot 2! times, move 1 to the right

Step 3: move 3! to the right, check that spot 3! times, move 1 to the right

Step 4: move 4! to the left, check that spot 4! times, move 1 to the right.

Continue in this fashion until you catch the sneaky fellow.

This strategy works because at some point all your future movements are multiples of the spy's movements. The shifting 1 to the r

Is it getting good?

And we could always use more answerers so subscribe!

This might be a bit vague but here it goes...

Some examples to set the stage:

Example 1) Based on the game 24

Q: Try and create the number 24 using standard arithmetic rules and all of following integers once; 1, 3, 4, 6

A: 6 / (1 - 3/4)

Example 2) A question based on a problem projecteuler.net

Q: Starting from the top-left corner of a n x n grid, without backtracking, how many ways can you take to get to the bottom-right corner

A: (2n!)/(n!*n!) or 2n Choose n

The first example is a bit trivial. If you had tried to solve it yourself it might take you a while to structure the arithmetic to get the right answer but once you know this type of "trick" then you

R = Rocks, P = Paper, S = Scissors

R P P P S R S R S R S S P P R R S R S P R S R.....  

Can you figure out my strategy?

Note: It's not based on words and I don't have amazing arithmetic skills though I am comfortable with numbers. Although I cannot continue for ever I know it's not repeating. If you solve the puzzle and also show the distribution of the outcomes is spread evenly (which I cannot do), I believe you solve a weaker case of a reasonably famous open number problem.

As I don't really make many puzzles this could be too vague and lacking info, or just poorly set up but I hope someone figures it out. Ask if something's not clear.