Final answer:
ENIAC's computation speed was one of the first popular demonstrations of computer power, showing rapid digital processing capabilities that were far superior to previous mechanical calculators.
Step-by-step explanation:
One of the first popular demonstrations of the power of computers was ENIAC's computation speed. The Electronic Numerical Integrator and Computer (ENIAC) was a significant breakthrough as it performed calculations at an electronic speed rather than a mechanical speed. This milestone in computing history showcased the rapid processing capabilities of digital computers, which was a stark contrast to the existing mechanized calculating devices of that time.
ENIAC was especially developed during World War II to calculate artillery trajectories, and by 1955 it had completed more calculations than all of human history combined. Its demonstration of high-speed calculations highlighted the potential of computers and paved the way for subsequent advancements.