The Inca referred to their empire as Tawantinsuyu, the four suyu. In Quechua, tawa is four and -ntin is a suffix naming a group, so that a tawantin is a quartet, a group of four things taken together, in this case representing the four suyu (regions or provinces) whose corners met at the capital.
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Japan fires world's most powerful laser to produce energy equal to 1,000 times the planet's power consumption. 1  LFEX device produced 2-petawatts (2 quadrillion-watts) of energy. 2  The energy used for the laser beam itself would only be powerful enough to run a microwave for around two seconds, the Osaka researchers claim.