What does Stephen Wolfram track?

Stephen Wolfram has shared that he tracks a significant amount of data over an extended period. Specifically, he has logged around a quarter million pages of notes on paper and keeps a record of approximately 3 million emails 1 .

To support his productivity, Wolfram uses a variety of systems, including a treadmill desk for physical activity while working and an outdoor laptop setup to get fresh air and sunlight. These setups seem to affect his productivity positively, though he hasn't specified exactly how he tracks their impact 2 .