Straw tower building during the MESA day held at PLU on Tuesday, March 25, 2014.

Ezequiel Branados, of Keithley Middle School looks at the world through different lenses at MESA day held at PLU on Tuesday, March 25, 2014.

Students with bridges line up for the stress test at MESA day held at PLU on Tuesday, March 25, 2014.

Setting up a bridge for a stress test at the MESA day held at PLU on Tuesday, March 25, 2014.

And the stressed bridge at the MESA day held at PLU on Tuesday, March 25, 2014.

MESA day held at PLU on Tuesday, March 25, 2014.

Denner Galindo, and Antonio Ryes, right, watch their bridge undergo a stress test at MESA day held at PLU on Tuesday, March 25, 2014.

Denner Galindo, and Antonio Ryes, right, watch their bridge undergo a stress test at MESA day held at PLU on Tuesday, March 25, 2014.

Denner Galindo, and Antonio Ryes, right, watch their bridge undergo a stress test at MESA day held at PLU on Tuesday, March 25, 2014.

Estefani Eufracio and David Castro, of Sheridan Elementary, build a straw tower MESA day held at PLU on Tuesday, March 25, 2014.