Electrophilic addition: In this addition reactions, an electrophile attack on double bond of alkene to form an intermediate carbocation and convert one of the pi bond to sigma bond. In second step the counter ion attacks on this intermediate to form saturated hydrocarbon as product.
Ketu is the reflection of all the baggage of values and motives that we have brought into this birth. With a proper study of the placement of Ketu in a Birth-Chart, we can also get a hint or an idea that in what area a person is bound to perform well and where his interests and inclinations lie in the current birth.
A hÄlau is Hawaiian word meaning a school, academy, or group. Today a hÄlau usually describes a hula school (hÄlau hula). The teacher at the hÄlau is the kumu hula, where kumu means source of knowledge, or literally just teacher. Often you will find that there is a hierarchy in hula schools - starting with the kumu (teacher), alaka'i (leader), kokua (helpers), and then the 'olapa (dancers) or haumana (students).