- our prefix makes us taller... sometimes.
- our infix is something you are, starting from today.
- our suffix is one of our elements.
Who are we and why is today (December 7, 2020) such an important day for us?
The suffix clue is related to science.
The grammar in the infix part is a bit stretched, read it as "You are ...., starting from today!"
The prefix clue is related to computer-science but a lot of people use it daily.