ytterbium

US scientists claim world`s most accurate clock

US scientists have said that they have built the world`s most precise clock, whose ticking rate varies less than two parts in one quintillion, or 10 times better than any other.

Aug 23, 2013, 09:22 AM IST

Atom`s shadow clicked for first time

Scientists have been able to click the shadow of a single atom for the very first time -- an unprecedented feat crowning efforts lasting more than five years.

Jul 04, 2012, 17:34 PM IST