Determining the passage of time in our world of ticking clocks and oscillating pendulums is a simple case of counting the seconds between 'then' and 'now'.
While humans have been making their mark on the surfaces of this Earth for at least tens of thousands of years, it's difficult to pinpoint the exact moment our impulse to record what we saw tipped into what we would consider 'writing'.
The hypertension drug rilmenidine has been shown to slow down aging in worms, an effect that in humans could hypothetically help us live longer and keep us healthier in our latter years.
Earlier this year, a caver was poring over satellite images of the Nullarbor Plain when he came across something unexpected: an enormous, mysterious scar etched into the barren landscape.
