Score
Title
173
Tired of missing Science AMAs? Message u/ScienceAnnouncements to add your username to r/science's AMA Mailer!
32120
Largest study on physical activity involving 130,000 people in 17 countries showed that household chores such as vacuuming, or walking to work, provided enough exercise to protect the heart and extend life, with 30 minutes of physical activity five days a week reducing the risk of death by 28%.
2091
Scientists create world’s first ‘molecular robot’ capable of building molecules
648
When a child sees one of his or her parents arguing with the other in a destructive way, it can take a toll on how emotionally secure the child feels. But it is okay if your kids hear their parents arguing, as long as they’re handling disagreements in a constructive way, a new study suggests.
16436
The nearly 900 giant stone statues discovered by the first Europeans to land on Easter Island seemed at odds with the 1,500 to 3,000 found living there. A new detailed study of the farming potential of the Island suggests it could have sustained 17,500 people at its peak.
84
Prior research has long shown that women are less risk tolerant in their financial decisions than men. New research shows that men and women do not think about investment risks differently. Instead, income uncertainty affects them differently, which leads to differences in risk tolerance.
13
Increasing atmospheric humidity and CO2 concentration alleviate forest mortality risk
9
Cargo ships are triggering more lightning storms at sea.
53828
Babies can learn that hard work pays off. MIT researchers found that babies who watched an adult struggle at two different tasks before succeeding tried harder at their own difficult task, compared to babies who saw an adult succeed effortlessly.
27
Jellyfish Don't Have Brains, But They Do Sleep
25
Studies have shown that air pollution can have negative effects on cardiovascular health and life expectancy. Now new research indicates that it is also harmful to the kidneys.
15
New Australian-led research has confirmed that smartphone apps are an effective treatment option for depression, paving the way for safe and accessible interventions for the millions of people around the world diagnosed with this condition.
296
Multiple sclerosis can be inhibited or reversed using a novel gene therapy technique that stops the disease’s immune response in mouse models, University of Florida Health researchers have found.
32
A new study demonstrates the strong influence ancestry plays in Americans' interpretation of whether someone is black, white or multiracial, highlighting differences in the way race is socially constructed in the U.S. compared to other parts of the world.
29
Wide-Faced People May Have A Higher Sex Drive
44
To find ancient life on Mars, new research says that scientists should look for vanadium. During fossilization, this element often replaces magnesium in chlorophyll, the pigment needed for photosynthesis.
7
Twin study elucidates environmental, genetic contributions to mouth microbiome and oral health
60
Study Reveals the Desire to Drink Alcohol at Night Is Due to Our Brain's Immune System
6
Forest fires in Southeast Asia during the El Niño droughts of 2015 caused considerable disruption to the biodiversity of the region due to the smoke-induced ‘haze’ they created, according to new research
72
Engineers have devised a framework for identifying key patterns that precede an extreme event like a rogue wave or instability inside a gas turbine. The method may help predict hotspots of instability affecting climate, aircraft performance, and ocean circulation.
27
Dogs Recognize Themselves in Test Based on Smell, Not Sight
19173
Poliovirus kills off cancer cells, stops tumor regrowth
3172
Scientists have engineered an antibody that attacks 99% of HIV strains and can prevent infection in primates, a collaboration between the US National Institutes of Health and pharmaceutical company Sanofi.
23
Seasonal variation in nutrient utilization shapes gut microbiome structure and function in wild giant pandas
68
A remarkably preserved 49,000-year-old skeleton shows that Neanderthal kids may have have grown slowly, like us
43
Study finds evidence that lower cigarette prices are associated with increased infant mortality, and higher prices are associated with decreased mortality; Researchers suggest lawmakers consider taxation to handle higher rates of infant deaths in certain areas
25
Your Brain Sees Faces, Even When You Don't
145
Science AMA Series: Hi Reddit, I’m Sarah Hörst, Professor of Planetary Science at Johns Hopkins University, here to talk about the outer solar system (especially Titan). Ask me anything!
23
When living systems are smaller than the wave length of visible light, scientists can use cutting edge animation to tell the story of what's going on.
22
Scientists have created a simple-to-produce device that uses sound waves to store quantum information and convert it from one form to another, all inside a single, integrated chip.
59
Drinking non-cow’s milk linked with being shorter
19
Ultra-light Aluminum: Chemists Report Breakthrough in Material Design (metastable/lightweight crystal structure)
38
Prozac (fluoxetine) can block the formation of bacterial biofilms on bladder catheters. The antidepressant can scramble efflux pumps in bacteria, meaning that it may eventually be re-purposed as an antibacterial agent.
53
New biomaterial could replace plastic laminates, greatly reduce pollution - An inexpensive and biodegradable biomaterial, comprised of cellulose pulp and chitin, can be used to sustainably replace plastic barrier coatings in packaging and many other applications.
10351
Science AMA Series: We are a group pf researchers that uses the MMO game Eve Online to identify Exoplanets in telescope data, we're Project Discovery: Exoplanets, Ask us Anything!
22
The oldest record of scoliosis has been discovered in a Permian aquatic reptile from Brazil.
11
Creation of single-photon entangled states around rotating black holes
1185
Scientists just discovered the first animal (the upside-down jellyfish Cassiopea) without a brain that sleeps. The results suggest that sleep is deeply rooted in our biology, a behavior that evolved early in the history of animal life and has stuck with us ever since.
1993
People significantly overestimate how noticeable their embarrassing behaviors are to others
20
Researchers develop a nano-composite foam for football helmets that can monitor details of head impacts in real-time; This may allow athletic coaches to monitor their players and watch for possible concussions
6
Poisonous frogs produce a powerful neurotoxin that protects them from predation. Researchers have wondered why the poison doesn't hurt the frogs who make it. New data suggests complementary mutations were selected for in the nicotinic acetylcholine receptor.
1 Doomhammer458 Science AMAs are posted early to give readers a chance to ask questions and vote on the questions of others before the AMA starts. Guests of /r/science have volunteered to answer questions; please treat them with due respect. Comment rules will be strictly enforced, and uncivil or rude behavior will result in a loss of privileges in /r/science. If you have scientific expertise, please verify this with our moderators by getting your account flaired with the appropriate title. Instructions for obtaining flair are here: [reddit Science Flair Instructions](http://www.reddit.com/r/science/wiki/flair) (Flair is automatically synced with /r/EverythingScience as well.)
9 SirT6 To what extent does the source of the sugar matter in terms of how it impacts neuronal plasticity and other behavioral traits related to addiction? It looks like in your study, you supplied the rats with 5% sucrose laden drinking water. Do you think you would have seen similar results if the rats had been fed a fruit-based diet that is high in sucrose. Also, I am having a hard time understanding exactly how sugary 5% sucrose water would be. What is the sucrose content of a soda, for example, by comparison?
4 redditWinnower This AMA is being permanently archived by *The Winnower*, a publishing platform that offers traditional scholarly publishing tools to traditional *and* non-traditional scholarly outputs—because scholarly communication doesn’t just happen in journals. To cite this AMA please use: [https://doi.org/10.15200/winn.150531.10661](https://www.thewinnower.com/papers/7608-plos-science-wednesday-hi-reddit-we-re-selena-and-arnauld-and-our-research-shows-short-and-long-term-sugar-consumption-can-alter-the-reward-circuits-of-the-brain-that-are-associated-with-addiction-ask-us-anything) You can learn more and start contributing at [*authorea.com*](https://authorea.com)
3 postdochell What about non-caloric sweeteners? It it simply the sensory experience of "sweet" or does it also require a caloric component?
3 divvyflax Regarding your study itself, I'm curious to hear a bit about your choice to use adolescent rats. Is this effect likely to be any different at different developmental stages? More generally, I'd be interested to know how you approach sugar consumption in your day-to-day life. It's certainly more ubiquitous that alcohol.
3 forgetremembering Would there be any merit to testing the sucrose solution with a soluble fiber like inulin to measure if the presence of an indigestible carbohydrate in any way mitigates the effect the fructose has on the brain?
2 PHealthy Hi and thanks for joining us today! This may be quite a reach but with countries implementing sugar taxes and seeing lowered consumption levels, do you think we might also see a correlated uptick in depression and suicide?
2 VoidsIncision Can these changes be reversed by ceasing or reducing consumption? Would the brain try and replace the "soothing" with something else until the underlying traumas are dealt with?
2 ombwtk 1) What is the threshold for overconsumption? 2) Does the packaging seem to matter (e.g. fruit vs fruit juice vs candy)? 3) Could you briefly explain what lead you to your hypothesis? Is it that sugar and alcohol cause similar reactions in the brain when ingested and so you project that sugar will have similar long-term consequences? 4) Do you know if any other component of a macronutrient has been analysed like this? If so, how did it compare to sugar? Thanks!
1 lucaxx85 Hi there! I'll ask what I think is the most obvious follow up question. Do you think that this similarity between sugar and alcohol is due to some specific biochemical similarity in the substances or because of similarities in the addiction mechanism, which can involve many addictions, even unrelated to "drugs" (e.g.: problematic gamblic).
1 6thGenTexan Wasn't there research being done on obese people and the number of sweet taste receptors on their tongues? I've known some morbidly obese people that seemed to get more of a kick from sugar than is normal. I agree with your hypothesis about sugar and alcohol. I think alcoholism is really an eating disorder and can be treated as such. I know from personal experience that if one eliminates sugar from their diet, you will stop craving sweets. I have also noticed that a high protein snack alleviates cravings for sugar. What could be the mechanism for this?
1 PLOSScienceWednesday Thank you- Please send us links to these studies- I would love to read them also.
1 0 Doomhammer458 Science AMAs are posted early to give readers a chance to ask questions and vote on the questions of others before the AMA starts. Guests of /r/science have volunteered to answer questions; please treat them with due respect. Comment rules will be strictly enforced, and uncivil or rude behavior will result in a loss of privileges in /r/science. If you have scientific expertise, please verify this with our moderators by getting your account flaired with the appropriate title. Instructions for obtaining flair are here: [reddit Science Flair Instructions](http://www.reddit.com/r/science/wiki/flair) (Flair is automatically synced with /r/EverythingScience as well.)
8 0 SirT6 To what extent does the source of the sugar matter in terms of how it impacts neuronal plasticity and other behavioral traits related to addiction? It looks like in your study, you supplied the rats with 5% sucrose laden drinking water. Do you think you would have seen similar results if the rats had been fed a fruit-based diet that is high in sucrose. Also, I am having a hard time understanding exactly how sugary 5% sucrose water would be. What is the sucrose content of a soda, for example, by comparison?
4 0 redditWinnower This AMA is being permanently archived by *The Winnower*, a publishing platform that offers traditional scholarly publishing tools to traditional *and* non-traditional scholarly outputs—because scholarly communication doesn’t just happen in journals. To cite this AMA please use: [https://doi.org/10.15200/winn.150531.10661](https://www.thewinnower.com/papers/7608-plos-science-wednesday-hi-reddit-we-re-selena-and-arnauld-and-our-research-shows-short-and-long-term-sugar-consumption-can-alter-the-reward-circuits-of-the-brain-that-are-associated-with-addiction-ask-us-anything) You can learn more and start contributing at [*authorea.com*](https://authorea.com)
3 0 postdochell What about non-caloric sweeteners? It it simply the sensory experience of "sweet" or does it also require a caloric component?
3 0 divvyflax Regarding your study itself, I'm curious to hear a bit about your choice to use adolescent rats. Is this effect likely to be any different at different developmental stages? More generally, I'd be interested to know how you approach sugar consumption in your day-to-day life. It's certainly more ubiquitous that alcohol.
3 0 forgetremembering Would there be any merit to testing the sucrose solution with a soluble fiber like inulin to measure if the presence of an indigestible carbohydrate in any way mitigates the effect the fructose has on the brain?
2 0 PHealthy Hi and thanks for joining us today! This may be quite a reach but with countries implementing sugar taxes and seeing lowered consumption levels, do you think we might also see a correlated uptick in depression and suicide?
2 0 VoidsIncision Can these changes be reversed by ceasing or reducing consumption? Would the brain try and replace the "soothing" with something else until the underlying traumas are dealt with?
2 0 ombwtk 1) What is the threshold for overconsumption? 2) Does the packaging seem to matter (e.g. fruit vs fruit juice vs candy)? 3) Could you briefly explain what lead you to your hypothesis? Is it that sugar and alcohol cause similar reactions in the brain when ingested and so you project that sugar will have similar long-term consequences? 4) Do you know if any other component of a macronutrient has been analysed like this? If so, how did it compare to sugar? Thanks!
1 0 lucaxx85 Hi there! I'll ask what I think is the most obvious follow up question. Do you think that this similarity between sugar and alcohol is due to some specific biochemical similarity in the substances or because of similarities in the addiction mechanism, which can involve many addictions, even unrelated to "drugs" (e.g.: problematic gamblic).
1 0 6thGenTexan Wasn't there research being done on obese people and the number of sweet taste receptors on their tongues? I've known some morbidly obese people that seemed to get more of a kick from sugar than is normal. I agree with your hypothesis about sugar and alcohol. I think alcoholism is really an eating disorder and can be treated as such. I know from personal experience that if one eliminates sugar from their diet, you will stop craving sweets. I have also noticed that a high protein snack alleviates cravings for sugar. What could be the mechanism for this?
1 0 PLOSScienceWednesday Thank you- Please send us links to these studies- I would love to read them also.