Between 2/1/2020 and 3/20/2020, my 401(k) and IRA accounts were down in value by something around 35%. However, since I left them alone, I lost nothing. And what do you know, on the entire year 2020, (1/1 - 12/31) those same accounts were up 18.9%. That follows a 23% gain in 2019, and was...