Math problems make more than a few students -and even teachers -sweat, but new brain research is providing insights into the earliest causes of the anxiety so often associated with mathematics. Experts argue that "math anxiety" can bring about widespread, intergenerational discomfort with the subject, which could lead to anything from fewer students pursuing math and science careers to less public interest in financial markets.

Some sobering news for parental foes of sex stereotypes: A new study reinforces the devastating impact stereotypes can have on girls when it comes to math.

Little boys may love their trains and toys, but as early as second grade they're already showing prowess on the mathematical front, sending a subliminal message to their female classmates about expectations for math test scores and even potential career paths, according to a new study, "Today" reports.