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The first creatures – bacteria – appeared on Earth about 3500 million years ago.  I look at the fossils that they left behind, and by tracing how they changed over time, work out how they evolved into amoebas, animals and eventually, us.

To find these rare and special early fossils, I go out to Scotland, Canada and even Australia to find rocks of the right age.  I hammer off chunks and ship them home to be sliced paper thin.  In the lab, I look at them at extremely high magnification with a microscope, to find bacterial cells fossilised before they had chance to rot away.

Once I know what these bacteria fossils look like and how to find them in the rocks on our own planet, I can begin to look for them on planets and moons in the solar system.  There may be nothing living now on Mars or on Titan, so I spend the rest of my time working out ways to tell if there ever was… How can we find fossil aliens, and where is the best place to look?

Pretty much every day in my job is different, especially in the summer where I could be travelling to look for new fossils in exciting new locations.  At the moment though, I have lots of fossils to keep me occupied.

I usually get up around 8am and read the science news and check we haven’t found aliens, before cycling into work.  I might spend a couple of hours on the microscope or electron microscope, taking photographs and recording my fossils.  I teach evolution, geology or astrobiology to undergraduate university students for a couple of hours a day too, either as classes or in small groups.

At lunchtime and on breaks, I will catch up with twitter and the blogs I follow, to make sure we haven’t found aliens yet.

I try to spend time writing up my results so that they can be published, but that can be really hard to do without getting distracted.  I usually end up writing something like a blog post or a magazine article that doesn’t have all the jargon in it.

I suppose I work quite hard, and often don’t finish work until late in the evening.  But it is always flexible, and when I don’t need to use the microscope, I can work at home or in a café.  There’s usually plenty of time for meeting with other scientists to chat about our results or our ideas.

In the evenings I go to dance practice, or do something arty to contrast with my sciencey day. Maybe even make a giant spiral evolution cake… See the making-of video here (I’m filming so you don’t get to see me!):