In animals like octopuses and cuttlefish that die shortly after mating, what is it that kills them? | AskScience Blog

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Thursday, July 7, 2016

In animals like octopuses and cuttlefish that die shortly after mating, what is it that kills them?

In animals like octopuses and cuttlefish that die shortly after mating, what is it that kills them?


In animals like octopuses and cuttlefish that die shortly after mating, what is it that kills them?

Posted: 07 Jul 2016 01:56 AM PDT

In documentaries about cephalopods, sometimes footage is shown of octopuses and cuttlefish post-mating indicating that they die shortly afterwards. They usually look very disheveled, with their skin peeling off it looks as though they are literally disintegrating. What causes this, is it some sort of super fast aging process?

submitted by /u/SirGuyGrand
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Why do our limbs sometimes move in sudden involuntary movements when we're trying to drift off to sleep?

Posted: 07 Jul 2016 04:31 AM PDT

Sometimes when I've been trying to drift off to sleep I've had one of my legs or sometimes both just suddenly move which sort of wakes me up abit more and frustrates me since I was comfy and the movement made me uncomfier. I've heard that it might be the brain trying to keep you awake, but surely when you're resting your body your brain should be trying to rest also?

submitted by /u/Sergeant_Steve
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Why does sleep deprivation lead to hallucinations?

Posted: 07 Jul 2016 01:27 AM PDT

Will there be a temperature difference between: hot tea that I let sit for 5 minutes and then add cold milk to, or hot tea that I immediately add cold milk to then let sit for 5 minutes?

Posted: 07 Jul 2016 06:50 AM PDT

I'm speaking in general here, but if you want specifics. Let's say the tea is 10 ounces, and starts at 100C, the milk is 2 ounces at 3C, and room temperature is 23C.

The different scenarios are:

  • one in which I immediately add the milk, and
  • one in which I wait till the five minutes is up before adding the milk.

In both cases I would take the temperature after five minutes have elapsed.

submitted by /u/turquoiserabbit
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If Google was using all their power to decrypt my sha256 12 letters password. How long would it take?

Posted: 07 Jul 2016 01:25 AM PDT

Why are there thousands of islands in the Pacific, but only a handful in the Atlantic?

Posted: 07 Jul 2016 02:37 AM PDT

If a fever is the body's way to fight infection, do people with a body temperature variation naturally higher than the average get sick less? If my natural body temperature is 98.7, will I get sick less than the average person?

Posted: 06 Jul 2016 11:41 PM PDT

How do dogs pant without hyperventilating?

Posted: 06 Jul 2016 12:19 PM PDT

They seem to be breathing in and out very fast. If a Human were to breathe at that rate we get dizzy

submitted by /u/yllier123
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There was a TIL I saw not long ago that stated that the core of the Sun was actually younger than the surface due to "the intense gravity". I thought, that as you got closer to a large structure like a planet or sun, the gravity diminished, so how is this statement true?

Posted: 07 Jul 2016 12:53 AM PDT

Edit: By "large structures", I meant more massive structures. Apologies for my misnomer.

submitted by /u/iatetoomanysweets
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Why radiowaves can travel through walls, microwaves/visible light can't, but x-rays/gamma rays need lead walls to get blocked ?

Posted: 06 Jul 2016 11:08 AM PDT

How does the SAT/ACT ensure that their tests are standardized despite using different questions for each new test?

Posted: 06 Jul 2016 05:54 PM PDT

If every time someone takes the SAT or ACT a new test with different questions has to be used, how is any of it standardized? I know some of it comes down to asking similar but different questions but how do the test-makers account for these changes? Is it possible for me to compare two different tests taken at different times or does the "standardization" only apply to those who took the exact same test?

submitted by /u/ABiologicalQuest
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How do predator bugs learn how to hunt?

Posted: 07 Jul 2016 06:02 AM PDT

This might sound like a broad question, but I'll preface it by saying that I marathon-ed some YouTube movies called "Monster Bug Wars" last night. I was pretty interested in the tactics that predator bugs can use to catch their prey, such as the Ogre-faced Spider actually casting a web net onto prey, how the Velvet Worm will spray its prey to pin it down, and how the Antlion actually digs itself into the ground to make a pit to catch incoming ants. It was also really interesting to see how some bugs were knowledgeable of their "opponent's" hunting tactics and dangerous points, like how spiders will try to wrap up an Assassin bug or a particularly dangerous ant by wrapping their mandibles shut so they can't harm the spider in its web.

My question is, how do they learn how to do this? I assume most bugs aren't around their mothers to learn like other larger animals, so how does the Ogre-face learn that "this is the way that the web has to be, and here's how to cast it," and how do other bugs recognize that "this is a spider, its fangs are super dangerous," with such small brains? Is it all learned, or pre-loaded into their brains at birth?

submitted by /u/X-Yz
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If I have no sense of taste, does my brain still experience the same satisfaction from eating sugar or other foods than if I had taste?

Posted: 06 Jul 2016 08:46 PM PDT

Or does this satisfaction happen because of the taste?

submitted by /u/corey0317
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Is there a universal minimum angular velocity any spinning object needs to have in order for the gyroscopic effect to "take effect"?

Posted: 06 Jul 2016 05:31 PM PDT

When a stable spinning object, such as a top or a bicycle wheel, drops below a certain angular velocity, obviously it loses stability, and falls over. I am wondering if there is a universal angular velocity any spinning object needs to have in order to be gyroscopically stable and what it is, or if it varies depending on things like the objects' moment of inertia or its angular momentum and how that minimum angular velocity would be calculated. I find gyroscopes pretty interesting, so I'm pretty curious to find out about this. Thank you for your responses :)

submitted by /u/OmegaDroid
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How does a leap second occur?

Posted: 07 Jul 2016 12:35 AM PDT

I read in r/worldnews that at the end of the 2016 year there will be an extra second. How can this occur? Is there a change in the earth's orbit or a change in gravity?

submitted by /u/RandyStansDad
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If a circle is the most efficient shape in terms of area to perimeter, what is least efficient? Is there a 3D equivalent?

Posted: 06 Jul 2016 11:12 AM PDT

What are isotones ?

Posted: 07 Jul 2016 03:53 AM PDT

Is there a way to measure the "size" of space-time?

Posted: 06 Jul 2016 05:55 PM PDT

I'm not entirely sure if I understand the concept correctly, so I apologize if this makes no sense. I was thinking about how big and old the universe is. Which lead me to think about the idea of time-space. So I was wondering how big-old is space-time? At first I thought (volume of universe) * (the age of the universe), but then I remembered that the volume of the universe isn't constant in time and time isn't constant within the space of the universe. Would you just double integrate the function V(t)*t(V) with respect to V and t?

Side question, do we know what region of the universe is the oldest? Youngest?

submitted by /u/IAm_The_Writer
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Why Is Gold So Rare? The Common Answer I Find Doesn't Add Up.

Posted: 06 Jul 2016 06:43 PM PDT

The common answer I hear is that atoms higher in the periodic table than Iron had to be made from supernovae (I get that.) And that as the mass of the atom increases more energy was needed to make it. Yet when I look at the periodic table I find Mercury and Lead right above Gold. It seems that Mercury and Lead are more abundant than Gold.

submitted by /u/laxisusous
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Does sponge absorb or adsorb water/liquid?

Posted: 07 Jul 2016 02:09 AM PDT

Please give an explanation. Thanks

submitted by /u/Zonten77
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Antineutrinos or neutrinos?

Posted: 06 Jul 2016 01:48 PM PDT

Are there more neutrinos or antineutrinos in the universe, as far as we know?

submitted by /u/neut3
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