Life depends on genes being switched on and off at exactly the right time. Even the simplest living organisms do this, but usually over short distances across the DNA sequence, with the on/off switch ...

Over 100 cars, trucks, 50/50 drawing, food trucks, and music by DJ Don from Cruisin Orlando. Sponsored by City of Longwood. 5-8 p.m. May 10, Longwood Historic District, Church Avenue, Longwood, free.