This song has some Hebrew lyrics, such as the line that roughly translates as 'What is happening Sec' (Hebrew doesn't have a word for Dalek so we must assume it refers to Dalek Sec). In the song the Hebrew word 'Korah' is chanted, which translates as 'The Happening', which could refer to the Daleks evolving.
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As revealed in Daleks in Manhatten/Eveloution of the Daleks, the Daleks are made out a metal called Dalekanium. The base of the dalek also provides a pickup for static electricity
The Daleks don't really have a personality have they have no emotions, actually just one! Beauty that is why they can never kill the doctor (Asylum of the daleks)
Fear and hate are the only emotions the daleks are capable of.
The daleks casing is made of polycarbite with a sheild. Cybermen are made of metal which isn't as strong.
Skaro