history: My computer software is being used in a lab I was just informed that my computer software is now being used in a school :) No way! Congrats!!! I bet you feel really excited.  How long had you been developing it?
current: Thanks. Its a big deal for me since I have been working on it for 4 years and I am so proud that kids will be using it!
next: I bet, 4 years is a long time to work on a project too.  I may not know you but as someone who had once wanted to get into development, I feel really proud for you.  That is a huge accomplishment! Congrats again!