Recent comments in /f/askscience
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[deleted] t1_jdtdnbo wrote
Reply to comment by adventuringraw in The two retinas are tied/linked together in the brain. Are they tied 1:1, so that each retinal point corresponds to the same retinal point in the other eye? I.e., each retinal point from one eye shares the same binocular neuron with its counterpoint in the other eye? by ch1214ch
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[deleted] OP t1_jdtdfhl wrote
Reply to comment by goosebattle in Can elephants canter or gallop? by [deleted]
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The_Pale_Hound t1_jdtdaip wrote
Reply to comment by celo753 in How did humans 10000 Years ago care about their Teeth? by Takaharu7
But rice and bread didn't exist 10.000 years ago?
LastLapPodcast t1_jdtcr6q wrote
Reply to comment by Primarch-XVI in Can elephants canter or gallop? by [deleted]
It's not misinformation. A bats wing and a whales flippers contain all the bones and joints in a hand but you don't say that those animals have hands. The foot to leg joint in elephants does not function the same as the ankle joint does in other four legged animals due to the way the heel structure is prevented from touching the ground. Yes, there is a joint there and yes it contains the same bones you find in feet but it doesn't do what those same bones do for other animals.
[deleted] OP t1_jdtc6w3 wrote
Reply to Can elephants canter or gallop? by [deleted]
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[deleted] OP t1_jdt9w5f wrote
Reply to comment by [deleted] in Can elephants canter or gallop? by [deleted]
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[deleted] t1_jdt9rfu wrote
FlattopMaker t1_jdt9cmi wrote
Reply to comment by zanderkerbal in Around 550 million years ago the earth's magnetic field almost collapsed, but then strengthened a few million years later. Scientists say this may have been due to the formation of the inner core. But why exactly would that cause the magnetic field to get stronger? by somethingX
The magnetic field both causes and impacts the rate and most development as evidenced by magnetosomes in the fossil record and organisms today. Some species exhibit greater function in hypomagnetic conditions, and may have evolutionary impact when combined with known mutagenic effects of radiation exposure. We don't have known mechanism of action identified yet for the HMF (hypomagnetic field) theory and observations. Link to a review of speculations about causes and effects relating the magnetic field to the Cambrian explosion.
goosebattle t1_jdt7tbi wrote
Reply to comment by LastLapPodcast in Can elephants canter or gallop? by [deleted]
Important follow up question? What popular dance moves could an elephant do? The Charleston, the mashed potato, the twist, or flossing for example? Can you teach an elephant how to Dougie? Or a choreographed routine such as the macarena, chicken dance, or hokey pokey?
Edit: jazz hands, spirit fingers, and Bollywood are unlikely as elephants lack hands to perform the requisite movements. Twerking is on the table though, but perhaps not literally.
[deleted] OP t1_jdt7av3 wrote
Reply to Can elephants canter or gallop? by [deleted]
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Primarch-XVI t1_jdt79ht wrote
Reply to comment by LastLapPodcast in Can elephants canter or gallop? by [deleted]
Okay, I was not aware that elephants had such limited range of motion in their ankles.
But an ankle is still an ankle, no matter how much it can do. Saying that elephants don’t have ankles is just spreading misinformation.
[deleted] t1_jdt6rwg wrote
Reply to comment by williamsonny in How did humans 10000 Years ago care about their Teeth? by Takaharu7
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[deleted] t1_jdt5p9y wrote
Reply to comment by acfox13 in Around 550 million years ago the earth's magnetic field almost collapsed, but then strengthened a few million years later. Scientists say this may have been due to the formation of the inner core. But why exactly would that cause the magnetic field to get stronger? by somethingX
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LastLapPodcast t1_jdt2dob wrote
Reply to comment by Primarch-XVI in Can elephants canter or gallop? by [deleted]
https://www.audubonsculptures.com/wp-content/uploads/2018/01/Anelephantfoot-1-e1517079923490.jpg
You can see from the skeleton that what you'd consider to be the ankle joint doesn't function like the ankle in other animals. The leg bones sit directly over with the animal walking on its toes. The calcaneum sits parallel to the ankle joint, essentially meaning the joint is fully extended any time the legs are straight. I imagine it as the same when a ballerina is on tiptoes, they also can't jump without either bending the balls of their feet (which elephants can't do) or by relaxing off their toes.
I will however concede that this alone isn't the only factor in the lack of galloping. The fact elephants have 4 forward facing knees also prevents a gallop.
Edit: the post below makes a very valid point that the joint in the front legs that performs the knee function is actually a wrist joint. The joint at the same level as the hind knees is actually a rear facing elbow joint. So it's more accurate to suggest they can't gallop because their legs bend the same direction when they walk/run. However the point around not being able to jump remains the same. The rear legs cannot produce the spring due to the way their feet are shaped and the way the joints sit. To gallop you must be able to propel your legs from the floor.
[deleted] t1_jdsvopx wrote
Primarch-XVI t1_jdsv5mt wrote
Reply to comment by LastLapPodcast in Can elephants canter or gallop? by [deleted]
Elephants 100% do have ankles. They’re just relatively weak, and elephants are so big that jumping just isn’t something their bodies can support.
[deleted] t1_jdsu4jp wrote
TheresNoAmosOnlyZuul t1_jdst6i3 wrote
Reply to comment by [deleted] in Can elephants canter or gallop? by [deleted]
Honestly it looked like that elephant might have some hip problems. It did t wanna move it's back legs separately. The definition of a gallop is that all four feet are off the ground at the same time which is a physical impossibility for an elephant. I'd say it's entirely possible that an elephant can do a trot. I'm unsure about a cantor.
PsychedelicJellyBean t1_jdssps3 wrote
Reply to comment by [deleted] in Can elephants canter or gallop? by [deleted]
It's lifting it's front legs as it runs but you can see how it's sort of dragging it's back legs, putting the weight on them. It's more like a fat labrador bounding lol. Not a complete canter but i see how close it looks.
[deleted] OP t1_jdss241 wrote
Reply to Can elephants canter or gallop? by [deleted]
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[deleted] t1_jdss16v wrote
Reply to comment by wazoheat in Around 550 million years ago the earth's magnetic field almost collapsed, but then strengthened a few million years later. Scientists say this may have been due to the formation of the inner core. But why exactly would that cause the magnetic field to get stronger? by somethingX
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Coomb t1_jdsre81 wrote
Reply to comment by Fenrisvitnir in The two retinas are tied/linked together in the brain. Are they tied 1:1, so that each retinal point corresponds to the same retinal point in the other eye? I.e., each retinal point from one eye shares the same binocular neuron with its counterpoint in the other eye? by ch1214ch
Is this supposed to be responsive to my point?
[deleted] t1_jdte503 wrote
Reply to Around 550 million years ago the earth's magnetic field almost collapsed, but then strengthened a few million years later. Scientists say this may have been due to the formation of the inner core. But why exactly would that cause the magnetic field to get stronger? by somethingX
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