NOVA: What have been the advances in technology that have made all these underwater discoveries possible? BB: It's the advent of sophisticated search systems. It's the development of robotics, the ...

Previously, Dr. Hallion was curator of science and technology at the Smithsonian Institution. NOVA spoke with him on the eve of the 50th anniversary of the breaking of the sound barrier.

One of the world's most popular lecturers on astronomy, Tyson is a familiar face to NOVA audiences, having hosted the miniseries Origins (PBS, 2004) and having been a featured scientist in prior ...