There are also some things you cannot know without telling others.
For instance finding out the address of MOMA in the first place may require asking someone or googling it.
The stronger version is that some interesting ideas can only come about by dialogue between specialists.
Sometimes a dilemma for scientists is whether to share and benefit from input but then perhaps give away the key insight to others. Q.v. Wilkes showing Crick Rosalind Franklin's DNA crystallograph.
Proper courtesy, accreditation and citation can in some cases avoid this - yet Wilkes told no-one he was working on Fermat's last theorem for many years until he thought he had a solution.