ART: Dr. Sketchy's presents the 2nd Annual Cute Girls on Bicycles, in celebration of Bike to Work Day on Thursday and coinciding with the monthly Sketch Tuesday. Three females and four bikes will model for your sketching pleasure.

7 to 10 p.m. // 111 Minna Gallery (111 Minna St) // $7-10

SCIENCE: At tonight's Ask a Scientist presentation, Science of the Bay Bridge, the seismic innovations within the bridge's simple-looking design will be discussed, along with recent incidents that have raised public concern and curiosity about the project. The event is in collaboration with KQED's QUEST Science and Environment Series and will start off with QUEST's The New Bay Bridge video.

7 p.m. // Horatius (350 Kansas) // $3 suggested donation