Paragraph 1
Today, many things are getting
. Scientists have just measured
very short. They recorded the shortest unit of time
measured - a zeptosecond. This is a tiny,
fraction of one second - a
of a billionth of a second. It is a
point followed by 20 zeros and then a 1. The
study atomic physics at the Goethe University. They used high-tech
to measure how long it takes a photon to cross a hydrogen
. The scientists said it took 247 zeptoseconds for this to happen. This is too
for humans to sense or see.
