Make Chirps vs Our Nuclear Timeline

This educational app displays gravitational wave chirps created by mergers of massive black holes in several different ways, giving users an intuitive understanding of these exotic disturbances of space-time itself produced by cataclysmic events in distant galaxies. FEATURES: • Simulation: Experience the intricate behavior of gravitational waves through physics simulation of inspiralling black holes that merge to form a final black hole which then “shakes off” its excess energy. • Visualizations: See the essence of gravitational waves via waveform plots, frequency evolutions, and spectrograms, to understand the patterns and how they depend on black hole masses. • Auditory Experience: Listen closely as you hear the evolution of gravitational waves, detecting the characteristic increase in time in strength and frequency. Try varying masses to see how pitch is affected. • Dynamic Animations: Witness the captivating dance of black holes in collision animations. Explore the propagation of these waves through space-time with mesmerizing spiral animations. • Educational Insights: Gain a comprehensive understanding of gravitational waves and the pioneering work of LIGO through informative text pages, enhancing your knowledge of these cosmic phenomena. COMPATIBILITY Compatible with iPhone and iPad, iOS 16 or later. ACKNOWLEDGEMENT Supported by the National Science Foundation with grant PHY-2110181.

Nuclear Timeline is an educational reference app that maps the history of confirmed nuclear test detonations from 1945 to today. Explore more than 2,000 events by date, country, location, and explosive yield. Browse a chronological timeline, jump quickly between years, search by site or test name, and view each detonation on a map with latitude and longitude details. The app includes tests conducted by the United States, Soviet Union/Russia, France, the United Kingdom, China, India, Pakistan, and North Korea. Country flags, yield data, and location details help make the scale and sequence of nuclear testing easier to understand. Designed for students, researchers, history readers, and anyone interested in nuclear history, Nuclear Timeline presents complex historical data in a clean, searchable format.