Extra Science Points
Alter your game files at your own risk and ALWAYS make backups!
On your computer, navigate to your save fils for Kerbal Space Program, and look for the "persistnet.sfs" file, which you should open with a text editing program. Next, scroll down to Scenario and you will see something like this:
name = ResearchAndDevelopment scene = 5, 6, 7, 8, 9 sci = 250.80179
Change the sci value to whatever number you wish, while keeping it realistic and leaving the decimal value in place. Then save the file and load the game to enjoy the benefits.
Press CTRL+ALT+SHIFT+D to access the debug console, which you can use to enjoy unlimited fuel, unbreakable joints, and other helpful perks.