Not everyone receiving a cash gifts want to make a 20% downpayment, though. Cash gifts are also allowed for low-downpayment mortgages including the FHA purchase mortgage, which requires a 3.5% downpayment; and the Conventional 97 mortgage from Fannie Mae and Freddie Mac which requires just 3% down.
Hardwiring Happiness is a psychology/but actually mostly a self-help book. I obviously went into it with expectations that weren't met, but it's not all bad. I did get the psychological research that I wanted and more.
David H. Rosenthal contends in his book Hard Bop that the genre is, to a large degree, the natural creation of a generation of African-American musicians who grew up at a time when bop and rhythm and blues were the dominant forms of black American music.