We're really torn between a trio of Philly Tech Week and Philadelphia Science Festival events happening this evening.

The drama may be as thick as on "The Apprentice" at tonight's "Switch Philly" competition. Five Philly startups will pitch their concepts in seven minute presentations, followed by a grilling from Mayor Michael Nutter (nothing like Donald Trump, thank heaven) Josh Koppelman and Ellen Weber. Two or three of the competitors were pre-screened by PTW organizers at Techicallyphilly.com. At least one was plucked from the masses showing at the Monday Mobile  Demo Night. Winner earns free office space and meetings with local investors. Showtime - 6 p.m. tonight at Levitt Auditorium, 401 S. Broad St. Admission is $10.

Also getting their game on tonight,  15 local studios will showcase their newest finished and developing wares at the "IGDA Philadelphia Game Showcase."  Indy Hall, 22 N. 3d St. hosts the event from 7 to 9 p.m. Free.

For the really deep thinkers amongst us, Philadelphia Science Festival celebrates "Science Superheroes" this evening  It's your chance to hear what some great scientific minds are doing to combat the depletion of fuel sources, the disappearance of arable land,  virulent bacteria and viruses and the warming climate. Chemical Heritage Foundation (a great exhibit space) hosts the event, 7 to 9 p.m. at 315 Chestnut St.

While I've got your eyeballs, also give due consideration to attending (as will I) the "PTW Entrepeneur Expo," happening tomorow  (Thursday) night from 6 to 9 p.m. at Levitt Auditorum, 401. S Broad St.

For more information, visit www.phillytechweek.com or www.philasciencefestival.org.