Short explanation about the mathematician Srinivasa Ramanujan's famous episode, taxi number 1729.

Short history explaining how neutrons were discovered. 

Brief explanation about the discovery of Au-Si non-crystalline phase in 1960 and later progresses of rapidly quenched materials. 

Short explanation about historically famous lightning disaster happened in the emperor's habitual residence in Kyoto, Japan, in 930.   

Short explanation of the history of Dr. Rontgen's discovery of X-rays in 1895.

Short explanation on environmental problems caused by microplastics.

Short history of Chicago Pile-1, the world first nuclear reactor built by Professor Enrico Fermi and his team. 

Short talk on the giant earthquake and tsunami. 

Short explanation on the coastline paradox, how the whole length of the coast line of Japan depends on the scale used for the measurement.

Short explanation on the Jules Gabriel Verne's 1864 novel, "Voyage au centre de la Terre".