Nvidia is more resilient than the market seems to think.Nvidia (NVDA -0.03%) stock has gone from blowing away the stock market in the first half of the year to whipsawing back and forth on seemingly small news items.It's unusual to see swings that amount to $200 billion in market value being added or taken away in just a single session. That's life for a stock worth nearly$3 trillion, though. Since Nvidia's stock hit an all-time high on June 20, it's moved up or down by 5% or more in 15 sessions, a reflect ...