iPhone Photo of the Day - One Determined Acorn

No, your eyes are not playing tricks on you. You are looking at an oak tree growing out of a boulder. I caught this out of the corner of my eye as I was treating out-of-town visitors to a tour of the far reaches of San Diego County's back country, 60 miles east of downtown and a mile or two from the Mexican border.

I quickly backed up the car and we got out, scrambling for a closer look. Indeed, a massive tree was growing out of solid rock. Its trunk and root system were literally splitting the boulder apart - the oak was eating the boulder for lunch. Draw any lessons you want, but never underestimate the mighty acorn.