Why 2,000-Year-Old Roman Concrete Still Stands

How is it that 2000 years later, certain Roman ruins still stand in harbors? Geologists have determined that it pertains to one of the components—aluminum tobermorite, a rare mineral found in volcanic ash. When struck with seawater (another component of Roman concrete, along with lime and rock), a possolanic reaction occurs where the tobermorite crystallizes and spreads—adding further strength. Thus, longterm seawater exposure only reinforces …


Build almost anything you can dream of—from ambitious room-sized structural installations to intricate table-top sculptures—with nothing more than JIX connectors and standard drinking straws. Portable and super light-weight, with JIX you’re able to construct highly organized geometric structures or free-form tangles by cutting, bending or using multiple colors of straws. JIX offers unlimited building possibilities.

California Skateparks’ Snake Run

A return to skateboarding's roots through innovative design and construction at Camp Woodward

Designed to mimic the sloping school yards and dried concrete waterways of Southern Califorinia, where skateboarding’s roots reach deepest, the snake run is the most fundamental form of all skatepark designs. While most snake runs are characterized by a long narrow path—or ditch—flanked by banks and berms to channel the rider through without pushing, the freshly poured concrete at Pennsylvania’s legendary camp Woodward resembles something …