timothy from the older-I-get-the-wetter-mars-was dept.
Matt_dk writes "Spectacular satellite images suggest that Mars was warm enough to sustain lakes three billion years ago, a period that was previously thought to be too cold and arid to sustain water on the surface, according to research published today in the journal Geology. Earlier research had suggested that Mars had a warm and wet early history but that between 4 billion and 3.8 billion years ago, before the Hesperian Epoch, the planet lost most of its atmosphere and became cold and dry. In the new study, the researchers analysed detailed images from NASA’s Mars Reconnaissance Orbiter, which is currently circling the red planet, and concluded that there were later episodes where Mars experienced warm and wet periods."
The best editing software for equations I've ever seen is latex, and I suspect it's still too slow for taking notes in class.
There used to be these crazy pens that could capture notes (and doodles) to image files... But it'd probrably be easier just to scan them later, as it'd give you a chance to review them anyway.