<prompt> Human: I am young and have just starting in investing in my 401k. I know the basics, but its hard not to be nervous. I take a look at the last 10 years 2003-2013 and I am nervous. I see this. What if there is another crash? I could add thousands of dollars to the stock market this year, just to see it cut in half next year.Then I think about how I would have seen this thirty years go. I would take a look at the last 10 years 1973-1983 and see this. We appear to be at a peak, I would think. I shouldnt invest now, what if theres another crash like 74 and I lose almost half of my money?But if I had invested in 83 this is purely hypothetical; I wasnt born yet in 83, I would look back on the crash of 74 and laugh at how nervous I was about what, over the long run was a tiny blip.Looking at the numbers this way makes me more comfortable with investing. Im dollar-cost averaging to get through the dips, and looking forward to seeing the likely though technically not guaranteed awesome gains over the long-term.Just my ramblings for the day.  <response>: Like a yo-yo on an escalator 