Calculate standard deviation, probable error, and error of the mean for surveying and civil measurements. Switch between imperial and metric units. Perform calculations for series of observations and single or combined accidental errors.
Learn US states, capitals, flags, mountains, rivers, and more through interactive games. Study mode provides state details like population, area, and density. Test knowledge with quizzes and track progress.
The app displays basic information for 118 elements, including name, symbol, category, and physical properties. Users can access more detailed information via Wikipedia and search elements by category or phase.
