Critics say such patents block progress against disease and development of new treatments.

VOA: special.2010.03.23

American activists have been tireless in efforts to block the development of the Keystone XL pipeline project.

FORBES: Come On Already, Let's Build Keystone XL

But the residents of Kemptown, which overlooks Black Rock, are concerned the chosen development will block their view of the sea.

BBC: NEWS | UK | England | Southern Counties | Seafront plan for ice rinks approved

And going ahead with the F-22 shouldn't in any way block development and funding of unmanned vehicles, which are becoming more sophisticated and deadly.

FORBES: Magazine Article