Any of the following:

• Materials needed to make an open source 3D printer, co2 laser, and pick-&-place machine
• Materials needed to make a hydroponics garden system and precision fermentation system
• Materials for a LiFePO4 battery and solar energy system
• Putting a dent in both my personal debt and that of my family and friends
• Donating that 20k to my local makerspace to improve their operations
• Starting a nonprofit