Question: What is the most exausting day you've had and why?

Mariam Orme answered on 14 Jun 2010:

Hmm, I’ve had some quite tiring days at work, when I’ve been rushing around doing experiments all day and ended up being at work for 12 hours or so.

But I think more exhausting that that was a recent walk I did to raise money for breast cancer research – I had to walk a marathon through the streets of London at night, and by the end of that I was pretty shattered!