What are the oldest mostly-unchanged tools that we still use? |
- What are the oldest mostly-unchanged tools that we still use?
- What is the difference in the Covid-19 tests currently available in the US, and which one is best for detecting asymptotic infection in vaccinated individuals?
- How are insane temperatures in fusion reactors measured?
- It is well known that pregnant women drinking alcohol can cause birth defects. Is it also possible for birth defects to be caused by the man's diet before conception?
- What role might chronic infections play in the emergence of new variants of a virus?
- Can a fluid flow from low pressure to high pressure?
- How bad was ionizing radiation output in 1998 CT scanners vs today?
- What is the difference between combustion deflagration detonation and explosion?
- Was there any science to the whole "moving to a drier climate for health reasons"?
- I go for walks along a canal in India, and I see stray dogs swimming effortlessly. Drowning incidents by kids in the same canal comes in news often. Does swimming come as an innate faculty for puppies? Elephants too for that matter.
- Is there a correlation between north and south hemisphere temperature extremes?
- What traditional medicines and treatments have been found to be both effective and explicable by modern medicine in recent times?
- Is it possible to season a pan chemically?
- How refined are other animals tastebuds compared to humans?
- What's the process of 'learning' on a neurological level?
- How does 2004 Indian Ocean Tsunami impact the marine wildlife in the region?
- Does rust act as a catalyst to form more rust?
- Is it true that, unlike dogs, modern cats are physiologically mostly unchanged from before widespread domestication?
- Is the small intestine somehow neatly organized inside your body, or is it pretty much just stuffed in there??
| What are the oldest mostly-unchanged tools that we still use? Posted: 10 Jul 2021 02:01 PM PDT With "mostly unchanged" I mean tools that are still fundamentally the same and recognizable in form, shape and materials. A flint knife is substantially different from a modern metal one, while mortar-and-pestle are almost identical to Stone Age tools. [link] [comments]  |
| Posted: 10 Jul 2021 06:08 AM PDT It seems like there are a few types of Covid-19 tests available, including a few rapid tests and even some at-home tests, but what are the differences, advantages and disadvantages of each? [link] [comments]  |
| How are insane temperatures in fusion reactors measured? Posted: 11 Jul 2021 03:16 AM PDT There was a headline recently that china had cracked a fusion heat record and produced a plasma three times hotter than the sun. How are these temperatures measured? Wouldn't any device that could do it be destroyed? Is it just like an assumption that is made based on how much energy is put into the system? How do they know that it is "really" that heat and that there aren't other factors (like inefficiency or problems with the insulation materials) that cause the heat to be different? [link] [comments]  |
| Posted: 10 Jul 2021 11:41 AM PDT |
| What role might chronic infections play in the emergence of new variants of a virus? Posted: 11 Jul 2021 07:50 AM PDT |
| Can a fluid flow from low pressure to high pressure? Posted: 11 Jul 2021 07:43 AM PDT |
| How bad was ionizing radiation output in 1998 CT scanners vs today? Posted: 11 Jul 2021 04:38 AM PDT If someone had a couple of CT brain scans in the late 90s with a CT machine possibly made in the late 80's, what amount of radiation could one be exposed to? How many millisieverts of radiation would a machine of that era be capable of putting out in a single scan? (Even if misused) What are the odds of getting a brain tumor from a scan with an old CT machine vs a modern one? [link] [comments]  |
| What is the difference between combustion deflagration detonation and explosion? Posted: 10 Jul 2021 03:40 PM PDT Im very confused between these four terms. I've been researching fire and how it works and I ended up with these ones. From what I understand Combustion is the process of fire. [link] [comments]  |
| Was there any science to the whole "moving to a drier climate for health reasons"? Posted: 10 Jul 2021 09:13 AM PDT I was watching tombstone and the talk about moving to drier/warmer climate for health reasons. I realized you see this a lot in movies around this time period. Was there any science to this or just an assumption. Or did this never actually happen and its just a Hollywood trope? [link] [comments]  |
| Posted: 10 Jul 2021 09:16 PM PDT |
| Is there a correlation between north and south hemisphere temperature extremes? Posted: 10 Jul 2021 05:32 AM PDT Sorry if this really is a stupid question, but does a hotter than normal summer in one hemisphere generally equate to a simultaneously colder winter in the other? And does, say a hotter summer in one mean it's likely to be hotter in the other 6 months later? Are they indicators of each other? [link] [comments]  |
| Posted: 10 Jul 2021 08:51 AM PDT Wormwood is a plant that has been used in traditional Chinese medicine as a treatment for malaria. Tu Youyou won the Nobel Prize in Medicine for isolating the active substance of the plant, artemisinin, which is now used as an antimalarial drug. I was wondering if there are other examples of modern medicine finding that traditional treatments were effective, as well as explicable by scientific methods. By the latter point I simply mean more robustly than "there is some statistical correlation between traditional treatment and recovery". By 'recent', I suppose I mean any time after the discovery of antibiotics, which I understand similarly had a widespread traditional use in many cultures before the discovery of penicillin. [link] [comments]  |
| Is it possible to season a pan chemically? Posted: 10 Jul 2021 11:27 AM PDT Title says all. Usually a pan is seasoned by using some oil and placing it on the oven so the oil polymerizes and creates a coating over it. Since it's a chemical process, is there a way to do the same without using heat that's also safe to use? [link] [comments]  |
| How refined are other animals tastebuds compared to humans? Posted: 10 Jul 2021 08:18 AM PDT |
| What's the process of 'learning' on a neurological level? Posted: 10 Jul 2021 07:58 AM PDT What is learning? Is it just memorizing information in order to reproduce it later when needed? I kinda feel that any breakthrough in science is coincidental. Either you have that certain idea or not. Same with a brain randomly forgetting information. Like you can increase the chances that a certain solution comes to your mind by constantly thinking about that problem. But the final outcome is always coincidental. We have no free will and everything down to quantum level is predetermined. [link] [comments]  |
| How does 2004 Indian Ocean Tsunami impact the marine wildlife in the region? Posted: 10 Jul 2021 03:57 AM PDT As a citizen of that region, I remember that shellfish that we caught months after the event were much bigger than usual. Some almost twice as big which leads to people avoiding eating them because there's a believe that they get to this size due to the victims of the tsunami. Of course, this is just my anecdotal evidence. I tried to search around the web for reports on marine wildlife, but most I found were concern of the envinromental impact on the land instead of the sea. [link] [comments]  |
| Does rust act as a catalyst to form more rust? Posted: 09 Jul 2021 10:00 PM PDT I've heard people making comparisons with rust and cancer. Is this sorta correct? Does the rate in which metal rust grow exponentially once it starts to rust? I ask because there's a bit of surface rust under my car. It's not much, and I was wondering if spraying corrosion inhibitor over it will stop or minimize it from rusting any further. However, if there's already rust, is it too late? [link] [comments]  |
| Posted: 09 Jul 2021 02:55 PM PDT |
| Posted: 09 Jul 2021 02:25 PM PDT |
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