Doodle 4 Google– the competition that pits K-12 students across the U.S. to come up with a doodle to replace the Google logo on the search engine homepage — has announced 50 national finalists. And Google has opened voting to the public to help narrow the 50 down to five, one per age group.

The annual competition, now in its fifth year, has the theme “If I could travel in time, I’d visit … ” The voting site, which also has a list of the national winners, opened at 6 a.m. PDT.

Seventh-grader Allison of Dickson, Tenn., said of her entry pictured above: “If I could travel in time I’d visit the prehistoric animals and plants. It would be fun as an explorer watching the friendly herbivores and their babies. I’m definitely not visiting the carnivores because I don’t want to be their appetizer. I may even discover the Googlesaurus, LOL.”