Mark 21 nuclear bomb
The Mark 21 nuclear bomb was a United States nuclear gravity bomb first produced in 1955. It was based on the TX-21 "Shrimp" prototype that had been detonated during the Castle Bravo test in March 1954. While most of the Operation Castle tests were intended to evaluate weapons intended for immediate stockpile, or which were already available for use as part of the Emergency Capability Program, Castle Bravo was intended to test a design which would drastically reduce the size and costs of the first generation of air-droppable atomic weapons (the Mk 14, Mk 17 & Mk 24). At long, in diameter, and weighing , the Mk-21 was half the length and one-third the weight of the Mk-17/24 weapons it replaced. Its minimum yield was specified at four megatons.
Claudio Bravo
On his return to the Camp Nou on 19 October 2016, in a Champions League group stage match, Bravo was sent off after handling the ball outside of his area, in an eventual 0–4 loss. After a number of high profile errors, including being beaten by all six shots on target in his previous two appearances for City, he was dropped to the bench in February 2017, with backup Willy Caballero replacing him; having finished with the worst save success rate (54.1%) among all goalkeepers, he was named by many journalists as one of the worst signings of the season.