The genome-wide genetic study carried out in 2010 by Behar et al. examined the genetic relationships among all major Jewish groups, including Ashkenazim, as well as the genetic relationship between these Jewish groups and non-Jewish ethnic populations. The study found that contemporary Jews (excluding Indian and Ethiopian Jews) have a close genetic relationship with people from the Levant. The authors explained that "the most parsimonious explanation for these observations is a common genetic origin, which is consistent with an historical formulation of the Jewish people as descending from ancient Hebrew and Israelite residents of the Levant".
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): The genome-wide genetic study carried out in 2010 by Behar et al. examined the genetic relationships among which Jewish groups?
Ah, so.. all major Jewish groups

However, the early Ming government enacted a law, later rescinded, which forbade Han Chinese to learn the tenets of Tibetan Buddhism. There is little detailed evidence of Chinese—especially lay Chinese—studying Tibetan Buddhism until the Republican era (1912–1949). Despite these missions on behalf of the Hongwu Emperor, Morris Rossabi writes that the Yongle Emperor (r. 1402–1424) "was the first Ming ruler actively to seek an extension of relations with Tibet."
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What years did the Yongle Emperor reign? 
Ah, so.. 1402–1424

LEDs have also been used as a medium-quality voltage reference in electronic circuits. The forward voltage drop (e.g. about 1.7 V for a normal red LED) can be used instead of a Zener diode in low-voltage regulators. Red LEDs have the flattest I/V curve above the knee. Nitride-based LEDs have a fairly steep I/V curve and are useless for this purpose. Although LED forward voltage is far more current-dependent than a Zener diode, Zener diodes with breakdown voltages below 3 V are not widely available.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What LEDs have a not very steep I/V curve?
Ah, so..
unanswerable