WELL, THIS IS THE 21ST CENTURY: 7th-Graders Discover Mysterious Cave on Mars. “A group of seventh-graders in California has discovered a mysterious cave on Mars as part of a research project to study images taken by a NASA spacecraft orbiting the red planet. The 16 students from teacher Dennis Mitchell’s 7th-grade science class at Evergreen Middle School in Cottonwood, Calif., found what looks to be a Martian skylight — a hole in the roof of a cave on Mars.”