Assertion: incubator's project | /r/HasProperty | a space elevator
Facets:
Source sentences:
text: Projects that X has considered and rejected include a space elevator, which was deemed to be currently infeasible; a hoverboard, which was determined to be too costly relative to the societal benefits; a user-safe jetpack, which was thought to be too loud and energy-wasting; and teleportation, which was found to violate the laws of physics.