Recent comments in /f/askscience

Jacquesatoutfaire t1_j1pou69 wrote

Reply to comment by thegagis in What does it mean for a population to be "genetically diverse"? by MysteriousLeader6187

To piggy back on this, genetic diversity increases survivability of a population. The population of Finland before this ancient famine was probably much more diverse. The famine was a bottleneck event which only allowed the survival of a certain group of people with genetic and/or social [read: monetary] advantages survived.

Fast forward to some hypothetical future calamity/bottleneck event and, if diversity has not recovered enough, the entire population could die out if they don't have enough people with advantageous genes to survive.

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Away_Ad_5328 t1_j1pmg4i wrote

Reply to What % of people got long covid who were vaccinated VS those who weren't? by CarrionAssassin2k9

Another study, and analysis courtesy of epidemiologist Katelyn Jetelina:

A recent study pooled more then 54 long Covid studies (which included a total of 1.2 million people) and found that 6% of individuals who had symptomatic SARS-CoV-2 infection experienced long Covid in 2020 and 2021. This is consistent with a massive study in Sweden (2020-2021) that found the proportion receiving a long Covid diagnosis was 1% among individuals not hospitalized for their COVID-19 infection, 6% among those hospitalized, and 32% among those treated in the ICU.

Today, the U.K. estimates that 3% of the general population has long Covid. In the U.S., the population-level burden of long Covid has been historically difficult to grasp. But in August 2022, the U.S. Census Bureau added four questions about long Covid to its Household Pulse Survey. What did they find?

  • 16 million working-age Americans (aged 18 to 65) have long Covid today. This equates to ~8% prevalence. Of those, 2-4 million are out of work due to long Covid.

  • The annual cost of lost wages is ~$170-$230 billion a year.

  • The prevalence of severe long Covid is unequally distributed across race/ethnicity and age.

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Rhododendronbuschast t1_j1pkxdj wrote

Reply to How is density measured in porous materials? by That_Lego_Guy_Jack

Depends on how exact it should be. I did an exercise on bread/baked goods quality control in uni once. You an either use a laser scanner to get a 3D model of whatever youre measuring (this is nice, because you can also get Information about coulour, but the scanner is expensive, you can measure pretty much anything though) or submersion in plastic beads / seeds (measure the volume before and after) this is extremly cheap and reasonably exact.

If it's a foam like whipped cream or stuff like cereal puffs: use a beaker and weigh But be aware that this is not the real density, but bulk density. You can look up some constants about which geometries have which void space in bulk and get an approximation for the density of the bulk good from the bulk density.

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DisulfideBondage t1_j1pkugs wrote

Reply to What happens if a mother‘a child has a non-compatible blood type? What will happen when she is pregnant? by thebookklepto

Risk is low during normal pregnancy. The risk is elevated during labor. If the mother’s blood gets into the child’s bloodstream it can cause pathological jaundice as the child’s immune system attacks the foreign blood cells breaking down the hemoglobin, elevating bilirubin levels.

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