Some people head to the islands for vacation. Others hop the pond to Europe. But billionaire and self-proclaimed nerd Charles Simonyi headed in a very different direction for vacation — into space. Simonyi reportedly paid $25 million for his trip to the International Space Station aboard a Russian Soyuz spacecraft. Simonyi, who was expected to head home on April 20, is the fifth space tourist to visit the space station. During his 10 days aboard, Simonyi planned to assist with experiments and use his ham-radio skills to communicate with U.S. high school students.