By any reasonable account, Amazon.com (NASDAQ: AMZN) is firing on all cylinders. The e-commerce giant is coming off a record year, where it posted more than $3 billion in net income on 31% revenue growth to $178 billion. The stock jumped 56% last year and is up another 34% in 2018, meaning it's more than doubled since the beginning of 2017.The company has big plans to disrupt even more industries with its acquisition of Whole Foods and plans to launch a health insurance company with JPMorgan Chase and Berkshire Hathaway.