BBC2y
The 12 and 24 hour clock
The first 12 hours of the day, from midnight to midday , are called AM ... saying AM and PM though - for this, we use the 24 hour clock. The 24 hour clock always uses 4 digits, and we use this ...
The University of Chicago Chronicle4y
The Doomsday Clock, explained
The time of the clock is currently 90 seconds to midnight. The Doomsday Clock is a symbol that represents how close we are to destroying the world with dangerous technologies of our own making. It ...
BBC5mon
The 12 and 24 hour clock
The first 12 hours of the day, from midnight to midday , are called AM ... saying AM and PM though - for this, we use the 24 hour clock. The 24 hour clock always uses 4 digits, and we use this ...