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.
113 SirT6 Hmmm. I'm not in love with the methodology or the dataset the authors use to reach the conclusion that there are no changes in racial discrimination in hiring in the US over the past 25 years. Let's [look at the data first](http://www.pnas.org/content/early/2017/09/11/1706255114/F1.expansion.html). The authors collected 24 studies relating to hiring discrimination and plotted the discrimination quotient over time. The slope of the trend line is relatively flat, leading to the conclusion that racial discrimination in hiring hasn't changed over the past 25 years. But looking at the data, I have a hard time getting on board with that conclusion. For arbitrary reasons, the study began the analysis in 1989. There are three data points here that are anchoring the trend line. Then there is a >10 year gap before the next study. These studies from the early 2000s all showed higher levels of discrimination. If we remove the 1989 studies, or just begin the analysis at couple of years later, we would reach the opposite conclusion - that racial discrimination in hiring practices has gone down over time! Also, just sanity testing the data makes me wonder how reliable all of these studies are. If we look at the studies from the 1970s, we'd conclude that racial discrimination in hiring is half of what it is today. That fails plausibility testing in my mind. Further, looking past the data, the methodology doesn't seem great. Here's how they collected the studies: > First, we identified all existing studies, published or unpublished, that use a field experimental method and that provide contrasts in hiring-related outcomes between equally qualified candidates from different racial or ethnic groups. Second, we coded key characteristics of the studies into a database for our analysis based on a coding rubric. This produced 24 studies containing 30 estimates of discrimination against African Americans and Latinos since 1989, together representing 54,318 applications submitted for 25,517 positions. Finally, we performed a random-effects meta-regression to identify trends over time. I am not a fan of including unpublished studies here. Crap in, crap out. I'd want to see some sensitivity analysis on what would happen if certain "low quality" studies were removed from the analysis. Ultimately, I have a hard time drawing any conclusions about trends in hiring practices and racial discrimination from this paper. The data looks messy, and the methods seem dodgy. This isn't a strike against these authors, in particular. Most meta-analyses suffer from similar problems, and should be read with extra caution.
8 oinklittlepiggy question. how can one assume that hiring policies are discriminatory? I take it this is assumed, yes? or is there evidence that indicates this was discrimination? Wouldn't these same data sets show anything you really wanted them to? Such as: no change in potential employability among racial categories since 1989?
2 blueliner17 Does the title contradict itself or am I reading it wrong?