Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Somer G. Anderson is CPA, doctor of ...

Pain comes from communication between nerves, the spinal cord, and the brain. Pain may be acute, chronic, neuropathic, or nociceptive. Acute pain is sudden and usually linked to injury, then improves ...

Melissa Horton is a financial literacy professional. She has 10+ years of experience in the financial services and planning industry. Robert Kelly is managing director of XTS Energy LLC, and has more ...