Feynman attended Far Rockaway High School, a school in Far Rockaway, Queens also attended by fellow Nobel laureates Burton Richter and Baruch Samuel Blumberg. Upon starting high school, Feynman was quickly promoted into a higher math class. An unspecified school-administered IQ test estimated his IQ at 123—high, but "merely respectable" according to biographer James Gleick. When he turned 15, he taught himself trigonometry, advanced algebra, infinite series, analytic geometry, and both differential and integral calculus. In high school he was developing the mathematical intuition behind his Taylor series of mathematical operators. Before entering college, he was experimenting with and deriving mathematical topics such as the half-derivative using his own notation.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Feyman taught himself many math subjects, including Trigonometry at what age?
Ah, so.. 15

Urban AC is a form of AC music geared towards adult African-American audiences, and therefore, the artists that are played on these stations are most often black, such as Des'ree, whose album I Ain't Movin' was massively popular amongst both African American audience as well as the wider national audience.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What is the ethnicity of artists commonly played on urban adult contemporary radio?
Ah, so.. black

A state's consent may be invalidated if there was an erroneous understanding of a fact or situation at the time of conclusion, which formed the "essential basis" of the state's consent. Consent will not be invalidated if the misunderstanding was due to the state's own conduct, or if the truth should have been evident.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What, if it formed the "essential basis" of a state's consent to a treaty, may invalidate that consent?
Ah, so..
an erroneous understanding of a fact or situation