life stories

We all know our days are numbered. (Well, unless this pans out — fingers crossed!) So, is there any benefit to being constantly reminded of that? The Life Expectancy Timepiece by David Kendrick is one way to find out: it displays your "actuarially determined lifespan," giving you a rough idea of how long you've got left.
It's possible for an asteroid impact to send rocks from other planets to Earth, which is how I got myself a Mars rock and why this guy thinks he's found aliens. New simulations show that it's possible for things to work in the other direction as well, sending rocks from Earth out into our solar system and on to interstellar space.