How long did it take dinosaurs to go fully extinct? |
- How long did it take dinosaurs to go fully extinct?
- Given the way the Indian subcontinent was once a very large island, is it possible to find the fossils of coastal animals in the Himalayas?
- Does lava at the center of the earth rotate with the crust, or does it keep still like water in a rotating glass?
- How were heavier elements than iron created?
- Why do intermolecular dipolar forces decrease at a rate of 1/r³ and ion-ion interactions decrease at 1/r rate even though the force that mediates them is the same (electromagnetic)?
- While driving, if you look at dips in the road that are far away they seem to reflect light from ahead like a mirror. Why?
- Would there be less drag when swimming if your body had hydrophobic coating?
- Can quartz make noise with electricity ?
- How can we see light beams even when they are not pointing towards us?
- If light is an electromagnetic wave , just like infra red or radio, can we use non optical instruments like Antennae to detect it ?
- What is the oldest expression we still use in modern times?
- Is the heat from a fire transferred by convection, conduction or by radiation?
- Why do some satellites need to boost themselves to stay in low earth orbit while others (Kosmos-2251) can cease function and remain in orbit?
- Are jugular veins redundant, or feed one side of the brain each?
- Why are modern birds dinosaurs and not fish?
- Who was the first to realize that the Moon is round?
- What would happen if the black hole in the center of our galaxy suddenly disappeared?
- How does our brain interpret what we see? further explanation inside
- How are food expiration dates assigned?
- Is superluminal communication possible?
- How do bladeless fans generate wind?
| How long did it take dinosaurs to go fully extinct? Posted: 29 Jun 2019 11:34 AM PDT How much of life was vaporized on impact, and how long could those that survived the initial impact manage to live? Was it a matter of hours, days, or years or even generations before the dinosaurs fully vanquished? Edit: I do realise birds and some other animals evolved from dinosaurs, but, as we just recently had a case of a bird species evolving itself back from extinction, let's just simplify to the big ones we all know and love from children's books and from Jurassic Park, the ones that definitely aren't around anymore :) [link] [comments]  |
| Posted: 30 Jun 2019 06:55 AM PDT |
| Posted: 30 Jun 2019 03:54 AM PDT I know the crust is a relatively thin layer and I can only imagine big layers of earth to be rotating around the center underneath the crust, if not the entire inside of our planet. But is there a point at which the hot fluid material inside stays still relative to the outer layers, just like water in a rotating glass? [link] [comments]  |
| How were heavier elements than iron created? Posted: 30 Jun 2019 03:53 AM PDT I've just read that young stars fuse hydrogen together into helium. After a few million years, the H in the core uses up and the star starts burning hydrogen outside its centre, expand and cool. Then, after the hydrogen is fused, it will start fusing helium, carbon, neon, oxygen, silicon and finally iron. But the last one doesn't fuse further. So, how did the heavier elements come into existence? I'm talking about lead, gold, silver, copper etc. They weren't created in stars, so where were they? [link] [comments]  |
| Posted: 30 Jun 2019 04:57 AM PDT |
| Posted: 29 Jun 2019 01:29 PM PDT |
| Would there be less drag when swimming if your body had hydrophobic coating? Posted: 29 Jun 2019 08:50 PM PDT Just watched this youtube video where a guy was coated in aerogel which made him completely dry even if he went shoulder deep into water. Which made me wonder if Michael Phelps was coated in this aerogel would their be less drag in the water which would = better times? [link] [comments]  |
| Can quartz make noise with electricity ? Posted: 30 Jun 2019 01:02 AM PDT Soo crystal oscillators use electricity to oscillate quarts for time measurement but can you get quartz to vibrate at an audible frequency that can be heard just from the crystal? [link] [comments]  |
| How can we see light beams even when they are not pointing towards us? Posted: 29 Jun 2019 10:28 PM PDT So light beams are usually cylindrical and point in a specific direction. From what I have learnt, if we see an object, light is reflecting off that object and into our eyes. If a light beam is not pointing at us i.e the light is not reaching our eyes, how are we still able to see it? P.S. I just realized how stupid this question may end up being, this is what you get from a dumb 15 year old [link] [comments]  |
| Posted: 29 Jun 2019 11:50 PM PDT Conversely, is it possible to use optical equipment to detect non optical em radiation, eg. a lens or mirror to detect radio waves ? [link] [comments]  |
| What is the oldest expression we still use in modern times? Posted: 29 Jun 2019 08:24 AM PDT Expressions like "to the bitter end" are relatively new, but are there some which made it over from old cultures? And how old would they be? [link] [comments]  |
| Is the heat from a fire transferred by convection, conduction or by radiation? Posted: 30 Jun 2019 02:09 AM PDT |
| Posted: 29 Jun 2019 12:07 PM PDT Kosmos-2251 ceased function in '95 yet stayed in orbit until it collided with an Iridium sat in '09. [link] [comments]  |
| Are jugular veins redundant, or feed one side of the brain each? Posted: 29 Jun 2019 11:37 PM PDT And would death be experienced differently depending on which side of the brain loses blood first? Bonus question: If you fall asleep with one jugular compressed, can you die from it? [link] [comments]  |
| Why are modern birds dinosaurs and not fish? Posted: 29 Jun 2019 10:31 PM PDT I've seen it said many times (eg https://xkcd.com/1211/ ) that modern birds are dinosaurs. But couldn't the same be said that all vertebrates with lungs are fish? What are the rules about whether descendant groups get excluded from a classification? Is this what's meant by "paraphyly"? [link] [comments]  |
| Who was the first to realize that the Moon is round? Posted: 29 Jun 2019 09:44 AM PDT There's plenty of info about the discovery that the Earth is round, but I can't find anywhere that discusses who first guessed/proved that the Moon is round. On the one hand it seems like it would be easy to figure out because of the way it is lit, but I could also see its synchronous rotation throwing people off. [link] [comments]  |
| What would happen if the black hole in the center of our galaxy suddenly disappeared? Posted: 29 Jun 2019 03:28 PM PDT |
| How does our brain interpret what we see? further explanation inside Posted: 29 Jun 2019 12:53 PM PDT I want to know in a general sense, does our brain put together the simple concepts first and then work its way up to the more complex details? e.g. You open your eyes after a long nights rest. Does your brain first differentiate whether it is light or dark, then the general environment you are in such as the shape of your room, then how large that room is, how much space do objects take up, then the what do those objects look like, what's kept in those objects or the fine details of their decorative design, etc. OR does it all happen at once, like a computer generating all details of a render simultaneously? Thank you for any help you can provide :) [link] [comments]  |
| How are food expiration dates assigned? Posted: 29 Jun 2019 02:45 PM PDT In other words, what is the process behind determining that my fruit snacks might not be as good in February 2021 as they are in January 2021? [link] [comments]  |
| Is superluminal communication possible? Posted: 29 Jun 2019 02:44 PM PDT I've never found a very clear answer to this question. By superluminal communication I mean some phenomenon that causes information to be transported over a distance faster than light travels over that same distance. In science fiction I often hear that quantum entanglement represents such a phenomenon but I haven't found the concrete science to support this. Thanks for your reply! [link] [comments]  |
| How do bladeless fans generate wind? Posted: 28 Jun 2019 10:07 PM PDT |
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