One of the Goals you can receive is to Complete X Trades. Trades are a good way to get rid of excess Cards and earn more Research.
Trades are offered on the terminal near the bottom of your screen:
The terminal will ask for Cards you have in exchange for Research:
It's up to you to decide if it's a worthwhile deal! If you don't think it's valuable, don't worry, the terminal will offer a Trade approximately every hour. Be sure to check out the deal even if you're just stopping in to open your Bonus Timer Pack!