Machine learning is being used in many areas like spam filtering, credit card fraud detection, handwritten digit and speech recognition, medical diagnosis, stock trading, face detection, customer segmentation, product recommendation, and helping utilities communicate with customers. Some examples highlighted are that anti-spam filters use machine learning to block over 99.9% of junk email, Baidu's voice recognition is 96% accurate, and 35% of Amazon's revenue comes from its recommendation engine. Fiveworx uses machine learning to help utilities segment customers and send personalized energy recommendations.