- For species with very long life spans (everything from Johnathan, the 187-year-old tortoise, or Pando, the 80,000-year-old clonal tree system), are there observable evolutionary differences between old, still-living individuals and "newborn" individuals?
- In the movie Gravity when Sandra Bullock is spinning out of control, would simply closing her eyes stop the spinning sensation?
- Is there a significant difference between the current Amazon forest fire and previous seasons?
- How are molecular structures determined with such precision? How were they determined in the past?
- What is the difference between plasma and ionized gas?
- Do ducks have the ability to count?
- How an Aerospike engine really works ?
- Could it be posible to capture the rotation of another galaxy on video?
- How does rotation speed affect a planet's gravity?
- If you were standing on the moon, would the sun rise in the east and set in the west?
- What do thing like Acetaminophen and NSAID's actually do?
- What happens when you send too much light to an avalanche photodiode (APD)?
- Why does eye dilation occur in regards to excitement, feeling good, and psychedelic substances?
- Can hybridity be determined before crossing plants?
- What conditions on Earth have helped in harboring Oxygen compared to other planets?
- This may very well be a stupid question but how comes that when you put an ice cube in a glass of water, the level of water doesn't raise when it melts, yet the level of the oceans raises because of the melting of the icebergs?
- How does sub-lingual medication get into the bloodstream?
| Posted: 23 Aug 2019 06:06 AM PDT |
| Posted: 23 Aug 2019 12:24 AM PDT |
| Is there a significant difference between the current Amazon forest fire and previous seasons? Posted: 22 Aug 2019 08:49 AM PDT |
| How are molecular structures determined with such precision? How were they determined in the past? Posted: 22 Aug 2019 10:31 PM PDT My question was inspired by learning that lutein and zeaxanthin are nearly identical molecules (C40H56O2), with the only difference between the two being that a single double bond is found in neighboring positions along a hexagon at one end of the molecule. These molecules are rather large. How are molecular structures determined so exactly? When did chemists acquire this capability? And what were the major milestones in our ability to determine molecular structure? I don't just mean how many of each kind of element and where they are, but also things as subtle as the position of a single double bond. A lot of molecules are smaller than a wavelength of visible light, so it's not as if we could just look at them under a microscope, yet we know their structures exactly. So how do chemists figure these things out? [link] [comments]  |
| What is the difference between plasma and ionized gas? Posted: 22 Aug 2019 11:52 PM PDT |
| Do ducks have the ability to count? Posted: 22 Aug 2019 02:34 PM PDT Some species of duck can have many ducklings at once. If a mother duck has 12 babies and one has gone missing and is out of earshot, does the mother know it? Will the mother duck "count" her ducklings and be able to tell one is missing? Can the mom recognize the ducklings as individuals and notice that "Susie" has wondered off again? Or are mother ducks blissfully unaware as long as their herd of ducklings is about the right size and that's why baby ducks have such a strong instinct to stick with mom? [link] [comments]  |
| How an Aerospike engine really works ? Posted: 23 Aug 2019 01:47 AM PDT Hi all, I'm interested in all things rocket, and I found the Aerospike engine very interesting (and super cool looking) -The bell shape is here to redirect the flow (that have a random distribution) so that its coming out on the right direction -> OK ->OK -On an aerospike engine, I quote Wikipedia : -> this, I don't understand, why, in that case, the thrust isn't expending on the side like a normal random flow firing in all direction ? the exhaust pressure is still much higher than air….. one side of the exhaust is on the spike make a "half" bell, right, the other, exposed to air, should just go in all directions, like it happens on bell engines ? If somebody could help me understand the difference, I will appreciate 😊 (i'm not sure if its more Physics or Engineering....) [link] [comments]  |
| Could it be posible to capture the rotation of another galaxy on video? Posted: 22 Aug 2019 09:46 PM PDT It is said that everything spins in the Universe – from galaxies to stars to planets. ... This spinning of galaxies continues even after their formation. Our Milky Way galaxy is one of these spinning structures and its entire disc of stars, gas and dust is rotating at around 168 miles per second. [link] [comments]  |
| How does rotation speed affect a planet's gravity? Posted: 22 Aug 2019 10:06 PM PDT Could a planet the size of pluto or Jupiter have the same gravitational pull as earth if it spans fast or slow enough? [link] [comments]  |
| If you were standing on the moon, would the sun rise in the east and set in the west? Posted: 22 Aug 2019 05:45 PM PDT What path does the sun take across the sky from the perspective of the moon's surface? How about the Earth? [link] [comments]  |
| What do thing like Acetaminophen and NSAID's actually do? Posted: 22 Aug 2019 04:49 PM PDT My question is fairly simple: I am curious if they just relieve the pain and get rid of it, or do they simply mask the pain? What makes them different from painkillers in their effect? Do they simply block some receptors? [link] [comments]  |
| What happens when you send too much light to an avalanche photodiode (APD)? Posted: 22 Aug 2019 01:48 PM PDT I can't seem to find anything online about how an APD's behavior will change if you continuously send it too much light. Does this cause a breakdown on the electronic structure and increase the dark counts over time? Or does it return to normal operation once you remove the light source and let it settle? [link] [comments]  |
| Why does eye dilation occur in regards to excitement, feeling good, and psychedelic substances? Posted: 22 Aug 2019 08:47 AM PDT I understand eye dilation in regards to lighting and how the act of dilation occurs to regulate the amount of light that enters the eye, but what function does eye dilation serve in regards to moments when you get excited, or when you are with someone you love? I've noticed that almost all kids have huge pupils. How and why do you think this occurs? [link] [comments]  |
| Can hybridity be determined before crossing plants? Posted: 22 Aug 2019 03:25 PM PDT If I take two varieties of plant, say pumpkins, and bred them together, how and at what point can I be sure if it is a hybrid or just a stable cross? [link] [comments]  |
| What conditions on Earth have helped in harboring Oxygen compared to other planets? Posted: 22 Aug 2019 01:22 PM PDT |
| Posted: 22 Aug 2019 06:42 AM PDT |
| How does sub-lingual medication get into the bloodstream? Posted: 22 Aug 2019 12:57 PM PDT How does sub-lingual medication get into the bloodstream? [link] [comments]  |
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