Physics students race rafts made from recycled jugs.
The school day was spent under the sun for some students at Florida's Fletcher High School Tuesday.
It all revolved around a pool and physics.
"We had to save a lot of bottles," said student Christian Mesa.
225 students participated in the 17th Annual International Milk Jug Raft Race, using jugs and bottles to build rafts to compete.
The idea is to see who's fastest and who will sink or swim.
"We're super excited, because we put a lot of effort into our boat," said student Kaitlynn Ford.
Fletcher High School physics teacher Mike Levine started the project several years ago to reward students for their hard work in the classroom.
"These days, high school kids get a bad rap for being lazy and not wanting to work but the kids who decided to take physics in high school really do ,challenge themselves beyond what the other students are doing," said Levine.
While it's fun, the project is also 10 percent of their fourth-quarter grade, so that means breaking out all the physics lessons learned over the year.
"Calculating buoyancy and not going over a certain amount of buoyancy," said Mesa.
Levine wants students to walk away with the best lesson of all: "Physics can be fun".