who started and completed the construction of qutub minar
Qutb Minar Qutab Ud-Din-Aibak, founder of the Delhi Sultanate, started construction of the Qutub Minar's first storey around 1192. In 1220, Aibak's successor and son-in-law Iltutmish completed a further three storeys. In 1369, a lightning strike destroyed the top storey. Firoz Shah Tughlaq replaced the damaged storey, and added one more.Sher Shah suri also added an entrance to this tower while he was ruling and Humayun was at an exile.[5]
Carbon nanotube computer Carbon nanotube computer refers to a computer built entirely using carbon nanotubes based transistors.[1][2] Researchers from Stanford University said that they had successfully built a carbon nanotube computer and their research paper published on 25 September 2013 in the journal Nature.[3] They named their first carbon nanotube computer Cedric.[4]