The one and only reason we went to solid fueled ICBMs is they have a shelf life. You can (and have to) keep them fueled indefinitely, so you don't have to waste precious minutes filling the tanks before launch. » 3/31/15 2:18am Tuesday 2:18am

It's not like graphene is some amazing new material. We've been using graphite as lubricant and writing material for too long for some consequence like this to not be noticed. Graphite is nothing more than layered graphne. » 3/30/15 7:21am Monday 7:21am

On the other hand, big diesels and 20-speed transmissions are heavy too. You're gaining several thousand pounds of batteries and electric motors, but you're also trading a several thousand pound high torque engine for a several hundred pound high power generator. » 3/28/15 2:14pm Saturday 2:14pm

This question assumes the lack of atmosphere. As you say, you will reach terminal velocity in short order. For a human on the surface, that's around 100-200mph, and there's some 4000 miles to go. Further, as you descend deeper, atmospheric density continues to increase, while gravitational force trends towards… » 3/26/15 8:40am 3/26/15 8:40am

The attacker has an order of magnitude more mass, and grasping appendages that will fit nicely around its neck. The only reason humans would ever have any problem with geese or swans is out of their unwillingness to harm the animal. » 3/23/15 2:47am 3/23/15 2:47am

Engineering use trumps dictionaries when talking about engineering designs. Just because dictionaries choose to follow common use of muddied terms does not mean the engineering world can afford such miscommunications. » 3/20/15 7:53am 3/20/15 7:53am