In a good sign that there are likely to be more space movies with realistic-style plots in the coming years, The Martian continues to rack up solid box office numbers – currently at $392,038,124 worldwide. Author Andy Weir has given lots of talks and interviews, many linked from here, but there is always room for another, especially for someone like Weir who gives such entertaining presentations. This video is from a talk this past summer at NASA Ames and was titled, The Martian: How Science Drove the Plot