The document discusses systems biology, which takes a holistic approach to analyzing complex biological systems through computational and mathematical modeling. It focuses on interactions within biological systems. The Human Genome Project is provided as an example of applying systems thinking in genetics, which has led to new collaborative ways of studying problems in biology. Systems biology aims to model and discover emergent properties of cells, tissues and organisms functioning as a system, using techniques like modeling metabolic and cell signaling networks. An example is provided of how physics and biology can work together through NASA's Twins Study, which looked at the effects of space travel by comparing identical twin astronauts, one who spent a year in space and one who remained on Earth.