In the category "Science" we currently track items of 31 persons. The most popular ones, by number of traded items, are:

Neil ArmstrongBuzz AldrinFelix Baumgartner
Helen SharmanCharlie DukeValentina Tereshkova
Jim LovellGene CernanEdgar Mitchell
Patrick MooreMike BannisterJim Irwin
Dave ScottYuri GagarinScott Carpenter
Michael CollinsEd MitchellJohn Young
Fred HaiseAlan Shepard 

You can find all people that we're currently tracking items for in the alphabetical index:
A    B    C    D    G    H    I    K    L    M    S    T    W    Y    

Recent Additions:

14/05/2019: Neil Armstrong with 195 items.Buzz Aldrin with 177 items.Felix Baumgartner with 125 items.Helen Sharman with 81 items.Charlie Duke with 67 items.Valentina Tereshkova with 52 items.Jim Lovell with 49 items.Gene Cernan with 48 items.Edgar Mitchell with 46 items.Jim Irwin with 42 items.Dave Scott with 41 items.Yuri Gagarin with 41 items.Scott Carpenter with 36 items.Michael Collins with 35 items.John Young with 33 items.