iOS/Android/Desktop: Default calculator apps suck. They work like a traditional handheld calculator, which only displays one value at a time and can only do basic maths. If you want to do anything more than calculate a sales discount, you’re better off with these free and cheap calculator apps.
Wolfram Alpha is a great search engine for data geeks, but it has plenty of computation tricks up its sleeve that are useful for the rest of us too. Here are some of the most useful.
Reading actual scientific research can greatly improve your understanding of the world, but if you run into unfamiliar measurements you can find the process derailed. Writer Ben Young Landis suggests using Wolfram Alpha to convert that measurement into something you can understand.