I have long taken delight in how the Net lets me rub electrons informally with scholars such as John Conway and Larry Trask.
On September 12, I wrote to Eric Weisstein of MathWorld:
If the tetrahedral rotation group is isomorphic to A4, as is easily shown, why are they listed as distinct groups of order 12?
It appears that my question triggered a major rewrite of the latter page. Wow. (The answer to my question is that there are two unrelated groups called T, both of order 12.)
2006: Trask died in 2004, alas.