شكراhttps://www.google.dz/imgres?imgurl=http%3A%2F%2Fwww.arageek.com%2Fwp-*******%2Fuploads%2F%25D9%2581%25D9%2584%25D8%25B3 %25D9%2581%25D8%25A9-%25D8%25A7%25D9%2584%25D8%25B9%25D9%2584%25D9%2585-01.jpg&imgrefurl=http%3A%2F%2Fwww.arageek.com%2F20 16%2F03%2F19%2Fphilosophy-of-science.html&docid=4I11BwpRtwop0M&tbnid=SRclvsDPnk wzKM%3A&vet=1&w=480&h=500&bih=657&biw=1366&ved=0ah UKEwjWpo_Akc7QAhWLbBoKHRysCfIQMwg4KAgwCA&iact=mrc& uact=8