SCIENCE This week, a small crack unzipped under the Santa Monica Mountains north of Los Angeles, waking millions of people with a magnitude 4.4 earthquake. (LiveScience) Feel the Earth move under your feet? Watch “Earthquakes 101” to understand why. Discussion Ideas Read through the short, great LiveScience article, then take a quick look at the overview of earthquakes in our “Forces of Nature” interactive. (Earthquakes are … Continue reading What Caused the ‘Shamrock Shake’?