Black holes are among the most extreme objects in the universe, and now scientists can model them more accurately than ever ...

Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Vikki Velasquez is a researcher and writer ...

A nondeductible IRA is a traditional IRA, but you can't deduct contributions for tax purposes. Nondeductible IRAs grow tax-free and are an option if you earn too much to deduct your traditional IRA ...

James Chen, CMT is an expert trader, investment adviser, and global market strategist. Andy Smith is a Certified Financial Planner (CFP®), licensed realtor and educator with over 35 years of diverse ...

Nonlinear phenomena are phenomena, which, in contrast to a linear system, cannot be explained by a mathematical relationship of proportionality (that is, a linear relationship between two variables).