Time is vital to the functioning of our everyday lives: from the watches on our wrists to the GPS systems in our phones.

The word puzzle answer caesium 133 has these clues in the Sporcle Puzzle Library. Explore the crossword clues and related quizzes to this answer.

Accurate timekeeping has always been part of humankind’s social evolution. At the Neolithic monument of Newgrange in Ireland, ...

The International System of Units then changed things, settling for this definition: "The second… is defined by taking the… transition frequency of the caesium-133 atom, to be 9192631770 when ...

The International System of Units then changed things, settling for this definition: The second... is defined by taking the... transition frequency of the caesium-133 atom, to be 9192631770 when ...

The International System of Units then changed things, settling for this definition: The second… is defined by taking the… transition frequency of the caesium-133 atom, to be 9192631770 when expressed ...