Question: What is the latest that any scientist has discovered?

Iain Bethune answered on 25 Jun 2015:

The latest thing that I have discovered is that a very large number (with over 2 million digits) is prime. We found this out yesterday, and in fact while we are double-checking this fact, we haven’t announced exactly which number it is. If you watch my Twitter feed over the next few days you’ll find out (@iainbethune)