David Axe writes about ships, planes, tanks, drones and missiles. Apr 02, 2023, 08:25pm EDT Updated May 5, 2023, 02:09am EDT A Challenger Armored Repair and Recovery Vehicle in British Army service.

However, not all innovations are equal and nor do they follow a constant upward trend. Instead, their evolution takes the form of an S-shaped curve that reflects their typical lifecycle from early ...