Most people can tell if you're angry based on the way you're acting. Professor Jeffrey Jenkins can tell if you're angry by the way you move a computer mouse.
The BYU information systems expert says people experiencing anger (and other negative emotions--frustration, confusion, sadness) become less precise in their mouse movements and move the cursor at different speeds.
Thanks to advances in modern technology, Jenkins and his colleagues can now gather and process enough data points from your cursor movement to measure those deviations and indicate your emotional state.