Shane Carruth's indie sci-fi flick Primer is one of the smartest, coolest movies in recent memory. Made for a mere $7,000 and featuring brain-twisting scientific and cinematic architecture, Carruth's 2004 film was a hit at Sundance and has maintained a devoted cult following ever since. Now you can watch it for free and find out why. If it's your first time seeing Primer, put on your thinking cap and buckle up. If it's your second—or third, or fourth—well, same advice, I guess.

(Side note: So where's the crazy talented Carruth been since 2004? Good question. Rian Johnson—the director of Brick and The Brothers Bloom—has a hint. That's probably in reference to Topiary, which hopefully will come along sooner rather than later.)

Via io9. Enjoy.