I remember my grad school days. Back then, I got to talk to folks about various fields of research. Knowing a wide range of graduate students really helped, and I just wish that I had more time back then to absorb their knowledge and interests.
Some of them were involved in cancer immunotherapy or related fields, for example. Would have been nice to learn more about what they did. Unfortunately, too much of my time and mental energy was already being poured into my own research work. That required virtually all of my free time, especially with my limited funding. Ugh. I wish that I could have taken a more leisurely approach.
That just wasn't an option, though.