Asians respond very nicely to negative reinforcement, whereas whites tend to respond better to positive reinforcement. Of course, parenting instincts co-evolve with cognition, so Asians parent more harshly than whites; the contrast is extremely dramatic when you have the yellow mom and the white dad raising the same kids, but I doubt they are different from any other members of their gender and race.
Yeah they've done studies - when they do speed-dating men of different races roughly agree on how attractive girls are and whether they want to date them, but girls prefer their own race (except for asian girls).
Yeah, you can see this by comparing Y-DNA to total autosomal DNA. The most impressive example is Brazil, where 97% of the Y-DNA is European, but only 60% of the DNA.
(Around 1900 Brazilian anthropologists were naively investigating the theory that the Brazilian climate lightened skin, since anyone could children were mostly lighter than their mothers.)
Yes, it's much higher; one reason the black intermarriage rate is high (so few black-black marriages).
Look at the stats on asian-white marriages in the infographic upthread. See how 50% of these couples are college-educated? So yes, their kids are smart too, like their parents. Likewise, if a dumb nig or latina has a white baby, he'll be much smarter than his mother. That contributes to the misconception.
"Hybrid vigor" is a result of reversing extreme inbreeding. You know how pure-bred dogs have weird diseases and tics? That's because making a new breed is often close to incest (sometimes, actual incest; use the same stud for multiple generations). That leads to "inbreeding depression" and also founder-effect mutations. Cross the inbred animal with an unrelated animal, and all the bugs disappear, you get a healthy puppy.
Humans are nowhere near this inbred, so there is no hybrid vigor when you make a mutt baby. In most cases whites can mate with first cousins or half-siblings with no consequences, because the baseline genetic similarity is very low. (Over many generations of cousin marriages and uncle-niece marriages, common in primitive societies, you do see inbreeding depression.)
In fact, genes coevolve, so in many cases human mutts have something "broken".
(This is all talking about the first generation, by the way.)