Ever bother calculating how long that run at 1g is?
2as=v^2 (assuming starting at rest)
v ~ 10000 m/s, a=10 m/s^2 (just to make the math pretty)
Combustible helium. Explains why Solar City can't make money even with government subsidies.
$8BB on a capsule (Orion) shows just how embarrassing NASA is.
The guy who has to pay $10k for the PEM stack?
#2 seems fundamentally limiting regardless of any improvements to the laser source. My Fourier optics are very rusty. What's the rule of thumb of divergence?