Scientific discoveries: The biggest breakthroughs of 2022

Scientists in many fields got little attention over the last two years as the world focused on the emergency push to develop vaccines and treatments for COVID-19. But labs and researchers remained busy, and this year they've reported a dizzying series of major discoveries and achievements. Scientists at the Lawrence Livermore National Laboratory in California announced in December that they had produced the first fusion reaction that created more energy than was used to start it. The long-elusive achievement marked a major breakthrough in harnessing the process that fuels the sun. "This milestone moves us one significant step closer" to "powering our society" with zero-carbon fusion energy, Energy Secretary Jennifer Granholm said.