Video shows how high you would be able to jump on different planets and Moon.

A dominant idea in society is that races are either cognitively equal, or that a cognitive gap between races is the result of (mostly) environmental factors. In recent years, many institutions have implemented policy regarding racial equality, which attempts to rectify a disproportionality between racial groups representation in higher education and workplaces relative to their share of the total population. This is done through preferential treatment based on race instead of merit, which puts high performing individuals at a disadvantage depending on their race. If it turns out that racial disparities in life outcomes are not the result of environmental factors, but instead cognitive differences between races, race based policy could be unwarranted and counterproductive.

Among academics there is little debate about the size of the gap itself. The contentious point is how much of this gap is due to genetic factors and how much is due to environmental factors. To estimate how much of the gap is due to genetic factors, a good starting point is twin studies. Twin studies reveal how much of the variance in a phenotypic trait (IQ) is due to genetic variance. This is done by comparing the correlation in IQ of monozygotic twin pairs (~100% genetic similarity) to the correlation in IQ of dizygotic twin pairs (~50% genetic similarity). This way we know the effect of a 50% increase in genetic similarity on phenotypic similarity. Twin studies show that the heritability of IQ is ~80% in adulthood, so 80% of the variance in IQ is due to genetic variance between people.
https://sci-hub.se/10.1038/mp.2014.105
https://sci-hub.se/10.1002/neu.10160
https://sci-hub.se/10.1016/j.intell.2014.01.008
https://sci-hub.se/10.1016/j.intell.2006.10.003
https://sci-hub.se/10.1016/j.intell.2008.10.010

So if the variance in IQ within the general population is 80% due to genetic factors, it is a good starting point to assume that the difference between blacks and whites is also for 80% due to genetic factors, unless we find a set of highly unusual circumstances (an x-factor) that are uniformly true for blacks and not for whites that disrupts the finding of 80% heritability in the general population. This is highly unlikely to be the case, as IQ tests are measurement invariant for race, and measurement invariance and an x-factor cannot both be true at the same time.
https://sci-hub.se/10.3390/psych1010017
https://sci-hub.se/10.1177/0734282917698303


https://boards.4chan.org/sci/thread/13090668

Macro video of gold ink as it dries

buffalo skulls to be used for fertilization, 1892.

The world's last commercial ocean-going sailing ship - The Pamir - rounding Cape Horn, 1949.