Compound interest. Compound interest is the addition of interest to the principal sum of a loan or deposit, or in other words, interest on interest. It is the result of reinvesting interest, rather than paying it out, so that interest in the next period is then earned on the principal sum plus previously-accumulated interest.
Guanches (also: Guanchis or Guanchetos) refer to the aboriginal Berber inhabitants of the Canary Islands. It is believed that they migrated to the archipelago around 1000 BC or perhaps earlier.
Summer Solstice Alignments. Heyerdahl, and those who believe the Guanches made the pyramids, have argued that the constructions are painstakingly designed with stepped levels and possible alignments made for ceremonial purposes, such as those that could have been carried out at the Summer Solstice.