Which NASA project holds the most promise?
- Fuel cells (50 votes)
- 3D printing for electric motors (10 votes)
- Lithium-air batteries (40 votes)
- Shape-shifting wings (31 votes)
- Aerogel antennas (4 votes)
- None of the above. They're all daft. (34 votes)
- OTHER. My opinion doesn't appear as a choice but maybe I'll send you an e-mail. (200 words or less, please. Remember we consider these e-mails for publication unless you specifically say otherwise.) (4 votes)