the plastic bottles simulate liquifaction. and a demonstration of shaking shows the power of earthquakes. he's on a continual quest to find examples that children can comprehend. the good doctor paid a visit to an elementary school in a suburb of tokyo. >> translator: notarranger, come in. >> reporter: he brought with him an experiment showing how quakes affect buildings of different heights. although his main field is avalanches, nohguchi expanded his scope after the great east japan earthquake. liquifaction can be a consequence of land under stress. he demonstrated what could happen with a bottle containing water and sand. when he shook it sand soaked with water moved at the bottom like liquid. the vibration caused balls with lower specific gravity than the sand to pop up. >> translator: we need to spark children's curiosity so they realize they have to help themselves. they also might help people around them during disasters. knowing the laws of nature will help make them better prepared. >> reporter: nature is the power th

liquifaction can be dangerous. when he shook it land soaked with water moved at the bottom like a liquid. the vibration caused balls with lower specific gravity than the sand to pop up. >> translator: we need to spark children's curiosity. they also might help people around them during disasters. knowing the laws of nature will make them better prepared. >> reporter: nature is the power that dr. nota ranger uses in his travels. and some day the children may become heroes themselves. >> an entertaining way to learn about natural disasters. >>> let's learn about the weather with meteorologist robert speta. many people are enjoying time off work for the golden week holiday. some people outdoors are popping up sun umbrellas but we are seeing cloudy skies this morning. what can we expect for the rest of the holiday? >> that does speak the truth today. we have been seeing warming temperatures but also the skies really starting to cloud up and temperatures cool down here on tuesday morning. that's really what you expect t