Final answer:
It takes 10 minutes to defuse the Spike halfway. If the Spike is full at midnight and doubles every 10 minutes, then it was half full at 11:50 PM.
Step-by-step explanation:
The question regarding how long it takes to defuse the Spike halfway involves understanding exponential growth and working backwards in time. If the Spike doubles every ten minutes and is full at midnight, then to find when it is half full, we need to go back ten minutes from midnight. Therefore, the Spike would be half full at 11:50 PM.