CLOCK acetylates (Ac) histones H3 and H4 in nucleosomes (green) to confer 'open' chromatin structure and enable CLOCK-BMAL1 to bind to the E-boxes in cognate promoters and turn on transcription.

FOR THE discerning timekeeper, only an atomic clock will do. Whereas the best quartz timepieces will lose a millisecond every six weeks, an atomic clock might not lose a thousandth of one in a decade.

Today most electric clocks or watches measure the steady vibrations of quartz crystals. But even the best pacemakers drift; in one form or another, creeping chaos eventually corrupts the order of ...

Sunrise alarm clocks mimic the gradually brightening light of the sun to ease you out of sleep. Think of it as a biological hack. “We evolved to align our sleep-wake cycles with the sun ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Picture a clock ...

As convenient as it might be to use your phone as an alarm clock, standalone alarm clocks come with all kinds of features that can make waking up — or even going to sleep — a little less painful.

A rising contender for the development of ultra-precise nuclear optical clocks is the nuclear first-excited state of 229 Th isotope. Its long half-life of 10 3 seconds and low excitation energy of ...

Clocks will go back an hour in the United Kingdom in the early hours of Sunday 27 October. This will mark the end of British Summer Time (BST) and daylight saving, and a return to Greenwich Mean ...

Fall approaches, and here’s when it is and when you need to change your clocks. Daylight saving time ends on Sunday, Nov. 3. Minnesotans will have to set their clocks back one hour on that day. Not ...

Image caption, Make the most of the extra sleep, if you can. But why do we change the clocks at all? Is it for a scientific reason, possibly to do with the positioning of the Sun in summer and winter?