Researchers realised that there was something weird about how earthquakes travelled through the ground. At first they thought the weirdness was due to a liquid core. This drawing proved they were half right.
The seismic waves from the Nepal earthquake were registered 8,000 miles away, all the way in the US – though this is completely normal. The story behind the incredible stations that monitor the world's vibrations is one worth knowing.
Can earthquakes ever be predicted? This question is timely after the magnitude 7.8 earthquake that struck Nepal recently. If authorities had more warning that the earthquake was coming, they may have been able to save more lives.