this morning on "world news now," market mayhem. it was the stock market's biggest drop since the financial meltdown of 2008. how the national debt crisis, money problems in europe and financial uncertainties have slammed wall street and your street. it's friday, august 5th. from abc news, this is "world news now." >> good morning. i'm tanya rivero. >> i'm daniel sieberg in for rob nelson. wall street's tremendous drop is already causing a huge impact on markets overseas today. if you haven't checked your retirement account over the past 24 hours, brace yourself for a jolt. we'll break down what's happening as it's basically having this ripple effect in markets around the world. >> unfolding as we speak. we'll see what happens.