askscience

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What are signs of Aspergers? How does one test for it?	1
Why do dentists cover you with a lead bib for your organs, but have no issue exposing your head (and brain)?	1
What science is happening when I move much faster with much less effort on a bicycle versus running?	1
Is it "cheaper" for a species to evolve indiscriminate sexual preferences? My understanding is that research around reproduction has always treated homosexuality as an outlier or aberration in evolution. How likely is it that this assumption is actually due to bias on the part of the researchers?	1
What causes certain species' males to be larger than females (such as primates) vs other species' females to be larger than males (such as some birds)?	1
In the movie Deep Impact, the smaller comet (about a mile wide) is said to create a tidal wave "100 feet high and 1100 MPH." How realistic is this?	1
In keto diets, "net carbs" are more important than "total carbs," accounting for fiber, sugar alcohol, etc., at a 1:1 ratio. What's the science behind this? Can a human eat 15g of sugar, and 15g of fiber, and call it 0g of "net carbs"?	1
I've heard COVID-19 described as, "the disease caused by the novel coronavirus." When testing people, is the test for COVID-19, or the novel coronavirus? If it's COVID-19, can someone test negative for but then later develop COVID-19?	1
Helium is more precious than I realized. What are the chances we lose access to helium in the next hundred years, and what is the alternative? Can we create helium?	1
My understanding it that alcohol can impair the body's immune system. How much does drinking alcohol, or being drunk, affect the body's immune response to COVID for vaccinated people? Is the affect localized (like alcohol impairment generally) or long-term? Does it affect vaccination effectiveness?	1

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