However, an old and highly controversial theory that simply changes the law of gravity can explain a key property of galaxies better than the standard dark matter theory, one astronomer reports. (sciencemag.org)
This can be answered with the help of one of the most controversial theory regarding stock market - The efficient market theory. (tradebrains.in)
That's consistent with a somewhat controversial theory that holds that sex evolved as a means to repair DNA damage, she says. (sciencemag.org)