Kids can have some good, clean fun while getting gross with science at the "Mess-tival" that kicks off this week at Rochester Museum and Science Center (657 East Avenue). Visitors of all ages can partake in experiments to discover the science behind different disgusting substances, including edible "poop," slime boogers, fake blood, and others on each themed day. Guests can also explore the wide world of germs with activities involving their own hands that are not for the squeamish. Live presentations by the Wildlife Defenders will take place at 12:30 p.m. and 2:30 p.m. each day.

The Mess-tival takes place Friday, March 25, and Saturday, March 26, and again Monday, March 28, through Sunday, April 3. All activities and events are included with the price of admission ($11-$13). For more information, call 271-4320 or visit rmsc.org.