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Science AMA Series: I'm Steven Strogatz, a professor of mathematics at Cornell University in Ithaca, New York. I apply math to biology and physics and love communicating with the public about math through books, radio shows, and New York Times articles, and I’m here today to talk about it. AMA!
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Researchers find that one person likely drove Bitcoin from $150 to $1,000, in a new study published in the Journal of Monetary Economics. Unregulated cryptocurrency markets remain vulnerable to manipulation today.
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Fracking is one of the least sustainable ways to produce electricity, says new study. When comparing environmental, economic and social sustainability, scientists find shale gas extraction ranks 7th out of 9 different energy sources.
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Conservatives are more vulnerable than liberals to "echo chambers" because they are more likely to prioritize conformity and tradition when making judgments and forming their social networks.
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The Varroa mite may be the biggest threat to honeybees. Now, scientists have found a new way to fight them. Tiny amounts of lithium chloride kill 90% to 100% of mites without killing bees.
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More than half of youth and young adults who had consumed energy drinks reported adverse outcomes, some serious enough to warrant seeking medical help. The adverse outcomes were significantly more prevalent than with other sources of caffeine such as coffee.
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Wildlife species are being exposed to high levels of rat poison in northwest California, with illegal marijuana farms the most likely source point. Study found 7 of the 10 northern spotted owls and 40% of the 84 barred owls collected tested positive for rat poison.
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The probiotic Lactobacillus reuteri may help treat colicky breastfed babies less than 3 months old. Study has found that the probiotic is twice as likely as a placebo to reduce crying by 50% after three weeks of treatment for colicky babies who are exclusively breastfed.
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The "Two Brothers" mummies were found in 1907 with a label showing their mom's name. DNA evidence shows they were not brothers but half-brothers.
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Group recreates DNA of man who died in 1827 not using his remains but just DNA samples from his descendants
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When an infectious disease cannot be contained, ants engage in “destructive disinfection.” Researchers exposed ant pupae (developing “babies”) to a fungus. The pupae were groomed to remove any signs of the fungus. Then, they were sprayed with formic acid, leaving behind a heavily damaged corpse.
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Dietary salt promotes neurovascular and cognitive dysfunction through a gut-initiated TH17 response
13
Chemists have synthesised several variants of THC, the active ingredient in cannabis. Its structure can be altered with light, and the researchers have used this to create a new tool that can be used to more effectively study the body’s own cannabinoid system.
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Genetically "normal" BRCA-1 genes with abnormal methylation are strongly associated with ovarian cancer. This may have clinical implications as current screening tests do not capture abnormal methylation.
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Surfers more likely to harbour antibiotic resistant superbugs, study finds - Beach Bums project looked at surfers’ faeces and found they are three times more likely to carry drug-resistant E coli bacteria. Researchers found that surfers swallow ten times more seawater than swimmers.
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New Study Links Pregnant Women Taking Acetaminophen with Language Delays in Baby Girls
23
For the first time, astronomers spot a supermassive black hole that has spewed out material twice, revealing its feeding behavior over time.
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A survey of 4000 millionaires found that only at higher levels of wealth are they happier than those at lower levels and that those that inherited their money were less happy than those who earned it
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After crows fight they touch and preen each other to make up
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A study that utilized a CT scan has made it possible to 3D print the skull of the dinosaur species Massospondylus that roamed South Africa 200 million years ago.
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In urban streams, persistent pharmaceutical pollution can cause aquatic microbial communities to become resistant to drugs.
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Study of 385-million-year-old shark suggests humans and sharks shared common ancestor 440 million years ago
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Robust prediction of individual creative ability from brain functional connectivity
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Human Emissions Made Ocean Heat Wave 53 Times More Likely - Three 2016 marine heat waves that killed whales, birds, corals, and shellfish from Australia to Alaska were many times more likely thanks to climate change.
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Cancer Risk: Why do women with melanoma do better than men
2018
Children who experienced severe peer victimization/bullying were more than twice as likely to report depression or low moods at age 15, and 3 times more likely to report anxiety. The severe victimization group was almost 3.5 times more likely to report serious suicidal thoughts or suicide attempts.
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Study finds that global warming exacerbates refugee crises | when temperatures in agricultural areas and seasons at the source countries varied away from an optimal value (of about 20°C), the number of people seeking asylum increased.
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Feeding live invertebrate prey in zoos and aquaria: Are there welfare concerns?
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Harvard Geoengineering researchers propose seeding of airplane engine exhaust with sulfuric acid (in the stratosphere) for better particle size distribution control that is suited to solar radiation management purposes
1
Caught a meteor falling outside my apartment tonight
0
Learning Dependent Chromatin Remodeling Highlights Noncoding Regulatory Regions Linked to Autism
3
Meta-analysis of action video game impact on perceptual, attentional, and cognitive skills. - PubMed
9
Western University researchers are finding a link between athletes with severe concussions and patients living with ALS — a degenerative neurological disorder.
5
UK group identifies a novel botulinum toxin gene cluster from Enterococcus species. This is the first complete botulinum toxin gene cluster identified in a non-clostridial genome.
37
Black Death spread by human fleas and lice, research shows
238
A new study suggests that older people who have worsening anxiety symptoms may be more likely to develop Alzheimer's disease. Anxiety disorders are common across the United States, thought to affect around 40 million adults each year.
101
A Military Medicine pilot study finds that meditation brings PTSD symptoms below clinical levels in 80% of veterans within 30 days, an average 54.5% decline in PTL-5 scores among the 46 veterans in the study
40
Here's a physiological reason why some people are more creative than others
3
The share of culturally different immigrants is a significant and sizable determinant of anti-immigration votes (research paper)
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A study has found that junior surgeons need years of training before becoming excellent surgeons. However, with the advent of robotic surgery, the junior surgeon's practice is significantly reduced, and evidence suggests that junior surgeons don’t acquire the skills they require.
3
Obesity shaved almost a year off life expectancy in the US, according to a new study PNAS.
1 shiruken Welcome to /r/science! You may see more removed comments in this thread than you are used to seeing elsewhere on reddit. On /r/science we have [strict comment rules](https://www.reddit.com/r/science/wiki/rules#wiki_comment_rules) designed to keep the discussion on topic and about the posted study and related research. This means that comments that attempt to confirm/deny the research with personal anecdotes, jokes, memes, or other off-topic or low-effort comments are likely to be removed (Yes, we all get that you want to be male sea turtles now). Because it can be frustrating to type out a comment only to have it removed or to come to a thread looking for discussion and see lots of removed comments, please take time to review our comment rules before posting. If you're looking for a place to have a more relaxed discussion of science-related breakthroughs and news, check out our sister subreddit /r/EverythingScience.
26561 99trumpets I study sea turtles. First, a minor clarification to the title - sex ratio is highly female-skewed *at certain beaches.* It has always been the case that some beaches closer to the equator (warmer beaches) produce predominantly females, while other beaches farther from the equator, especially the “polar-most” beaches at the very fringe of the nesting range for certain species, produce mostly males. For instance in the US it has long been the case that southern Florida beaches produce mostly females while the North Carolina area produces most of the males (for loggerheads & greens). What’s happening now is a sudden skew in ratios at both types of beaches, the mostly-female beaches going to all-female and the mostly-male beaches going to approx 50:50. The question is, can sea turtles alter nest depth or shift “polarward” to establish new male-producing nest sites, i.e. colonizing new beaches that haven’t been used before. Some recent studies have found that females at the “hot” beaches are indeed digging deeper (cooler) nests, apparently in a response to sand temperature, but that this is only partially effective (i.e. even the deep nests produce mostly females. Those deeper nests do produce a couple more males, but not enough to ensure optimum fertility of all females). However, sea turtles are also shifting their range. For instance in the US, Assateague Island (Maryland) just had its first loggerhead nest, which produced 100 hatchlings, likely predominantly males. Kemp’s ridleys too are coming out of the Gulf of Mexico & starting to move up the eastern seaboard, and encouragingly Texas had a record number of Kemp’s nests last year (they usually nest in Mexico). But a considerable problem here is that turtles are moving into areas that have not historically had them and that therefore don’t have basic protections set up to help nesting turtles. Cape Cod has been overwhelmed by a huge influx of young Kemp’s ridleys that end up stranded on the northern shore, in enormous numbers recently. Re nest habitat generally though, sandy beaches are usually intensely developed for human recreation and baby sea turtles don’t fare well with the “coastal roads + strip of houses + strong street lights” setup that we humans tend to put along most beaches. This is one (of many) examples of species trying to shift their range in response to climate change, but in the process leaving the southern wildlife refuges & policies that had been set up to help them, and moving into more northern areas where no such protections yet exist. There is an interesting issue here of species moving faster than wildlife policy can keep up. (Same issue is occurring w N Atlantic right whales btw, which have just moved out of fisheries/shipping zones that were carefully arranged to not overlap w the whales, and into Canadian waters with no such regulations, the result being the worst die-off ever recorded, last summer. Ships smashing into them left & right, whales with horrific entanglements washing up dead. The Canadians have not had right whales up there before so it just took them all by surprise.) Anyway, sea turtle survival may eventually depend on residents of mid-latitude beaches that have not historically had turtles being willing to rapidly change beach lighting/traffic policy to encourage sea turtle nesting. These mid-latitude beaches are the ones that can produce the males in the future. For example, US coastal residents in Maryland, Virginia & Long Island can help by watching for turtle nests & reducing lighting when nests occur. Though... the pace of change may become so rapid that we may need to move eggs, physically, to northern beaches so that those individual hatchlings will imprint on northern beaches. This is known as “assisted migration” and it may become essential, especially when the beaches themselves start moving/flooding as sea level really begins to change. tl;dr - This is solvable if turtles can move to different nest sites, but we may need to help them move.
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413 farsidius The sex of a lot a reptiles are determined by the temperature at which the eggs incubate. I used to raise and breed several species of old world chameleons and I could skew the sex ratios of the clutches by altering the temperature of the incubators. In only takes a couple of degrees change. This is shift in the sex ratios of the turtles is a very obvious indicator of temperature change in these regions.
194 0ldgrumpy1 Would global warming mean that new beaches become suitable for the turtles to use? Transfering eggs to cooler area beaches would give a reverse sex imbalance on those beaches.
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314 sammyb67 What is the normal ratio?
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140 BlackNerve Oh I can see the puns and commentary about this already. I'm sorry to sound ignorant but how is it that temperature determines sex? What is the science behind this? And what does this mean, collectively, with such a wide ratio between female:male? Would it mean that we could theoretically engineer an environment (lower sand temps) to increase the male population?
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