1,800 fruit flies (Drosophila melanogaster) will travel to the International Space Station tomorrow so that the impacts of weightlessness on the heart can be studied. Living in near zero-gravity conditions is known to have a detrimental effect on the cardiovascular system, and fruit flies share 75% of disease-causing genes with humans. Eggs and parents who will lay eggs, will spend a month in space, enabling researchers from the Sanford Burnham Prebys Medical Discovery Institute in La Jolla, California, to study flies that have spent their entire life in an almost zero-gravity environment. To find out more go to Fruit Flies Journey to International Space Station to Study Effects of Zero Gravity on the Heart.